Ignoring my advice, Dad (90) got scammed again. Do I need to do anything else?

No, graygrammie. Your father is not capable of living on his own anymore. Not if he doesn't know how to avoid getting reeled in by a scam.
You do need to take control of his finances and assets because he cannot be allowed to be in charge of them anymore.
You say that your dad is lonely since your mom died last year. Know what happens next? He'll get scammed by some woman. Then his money is gone and what can you do if he has to go into care or needs to hire homecare? Likely the scam will be an internet romance with some woman in a third-world foreign country. Or like what happened to my father. He got scammed by a homeless, alcoholic prostitute half his age. He bought her a home, a car, and she ran up the bills. Then he had a stroke and had to go in a nursing home. I became responsible for putting out the fires and trying to clean up the mess. I don't want this to happen to you. Please go for conservator/guardianship.

OMG. I'm so sorry for you. With no offense intended the old saying, 'there's no fool like an old fool' fits this situation like a glove.
Your father cannot be allowed to have access to money. No more.
You have to petition the probate court in the town he lives in for conservatorship/guardianship over him.
If he's already lost thousands of dollars because he's mailing boxes of cash to scammers on the internet, that will graduate to him also giving out his home address and inviting them over.
Apply for conservatorship because he can't look after himself anymore.

I forgot: have you placed fraud alerts with the credit reporting agencies?

So he FedExed them cash? Yikes. If you are his FPoA you need to take total control of his accounts so that he can't access the majority of it at all. Give him a pre-paid Visa card with a limited amount of funds and tell him once that's empty it'll be another xx days before it will be refilled.

If you are not his FPoA or legal guardian I'm not sure you can control what he does with his money. The bank is not responsible, either.

Your dad sounds like he has enough incapacity which means his PoA needs to take over managing his affairs asap. Sending him to his bank by himself won't solve anything. Honestly if you're going to spend energy reporting the scam I personally think your energy is better spent on time with him in person to figure out if he's even really capable of living on his own anymore. I appreciate you reporting the scam but I think you have bigger fish to fry first. Wishing you success in recovering what you can and moving forward with a plan for your dad.

If Dad doesn't know how not to get scammed, he's not going to know to contact credit agencies, even if you provide the numbers for him.

You need to get on the credit agency sites and freeze his credit. (They won't know if you did it or he did.) I doubt he'll be applying for credit anymore anyway, so just keep it frozen. The important thing is not to lose the unlocking password they'll send to him. (Intercept it if possible.) That's the only way to unlock his credit if needed, but I'll tell you, I locked my parents' credit and never unlocked it for the rest of their lives.

You need to get Dad moved somewhere. He's not safe, and money isn't the only danger he's in if someone knows the name and address of a vulnerable old man.

It's always sad to learn of someone having been scammed, especially someone who really believes he's been offered a good opportunity.

I took a different approach, beyond taking control of finances.    I've been through the "charity donation", and as posted elsewhere sometime ago, I leveraged the desire to help others to become more involved.    Quick research on most of the worst greedy charities reflected that their execs were paid more like real business execs.   And some made over $100,000 annually, which no one in our family ever has.

So, when solicitations were received, I checked out the entity, located the data on exec compensation, and advised that it was over $100K.   No donation was given.  I also did research on really good charities, and we concentrated donations on those entities.   Eventually, I took over all finances b/c of difficulty in writing checks and the entire issue of donation became mute.

Your father's situation is different, but could be verified by tracing the source of the alleged grant if it had been possible for you to be aware of your father's activities.   And therein lies the problem.

I agree that more control needs to be in place up front, before any solicitations, or "great offers" are received.   The control needs to be at the source.

I would like some information though, if you don't mind.  Has Lifelock actually done anything to monitor his credit, and advise you, or was the info provided just general information?  I ask b/c Norton has taken a different twist in getting involved in this, and claims to be a top notch monitoring entity.  However, they never advise of anything other than their perceived greatness.

Will your father let you become involved in monitoring his mail, and his FB account?  If not the latter, can you D/C the account entirely and find a way to prevent him from opening another account?  (I never have and never will use FB for anything and am uncertain of options, especially since Zuckerberg is now under such stress that he's considering renaming his cash cow.)

Other advice is good, but I know how devastating it can be when someone takes control of a basic human need for managing one's own finances.   Can you think of a way to become involved in his finances by working with him, perhaps on a weekly basis to pay the bills, then follow it with a meal out, drive around to see the leaves, or visiting someplace soothing, like a park?  

My thoughts are linking joint bill playing to pleasant activities, so that he wants you to work with him to manage his funds.

You can also create a financial plan, fudging a little if you have to, reflecting that he'll run out of money if he doesn't follow a specific financial management plan?   Then reward him with a meal out, or new clothing, or something he enjoys, when he adheres to the plan? 

You know him better than we can; is there some way you can get him to rely on you more before engaging in spending activities with unknown entities?

On the other issues, contact the State Police and find out if they have a specific task force for frauds.  Ours did, some years ago.  

Sorry I can't come up with more ideas; these are always challenging situations.

I just want to comment on your mention of keeping money in a safe deposit box to be used after death - unless things are very different there than here in Canada if he is the sole owner of the box you won't be allowed to access it, it will be frozen just like all his other assets.

GG; I will leave the comments about your dad getting scammed and whether or not he is capable to filing for credit reports, etc. to others.

I have one comment, which is that YOUR husband has dementia, among other ailments. Allowing him to tell you whether or not to put bills on autopay is just crazy. The dementia patient should not be "driving the bus".

The bank/lawyer are saying that the box will not be sealed upon learning of your father's death?

That would be unusual in my experience.

Thank you for all your advice and comments. For the most part, you are telling me things I've been telling myself, plus you've educated me on a few things.

The bank has told me that if I come in with a key to the box, then I have access to it.

After mom died, dad had the will redrawn at the advice of a lawyer friend to a very simple 50/50 split between my sister and I. The lawyer said this was a better way to do things and would avoid probate. From what I read here, I wonder about that counsel.