My wife is in finance, when she asks for a large check from the bank she always explains to them up front what it is for, like a pre-emptive strike, that way the suspition is low. There are banking rules "know thy customer" and others where they banks have to protect against terrorist and money laundering and such. You should take it up with the federal goverment not some teller doing Her or his Job.
example I cashed a large check, needed to add my name to spouses account becasue the check was to both of us. Just sat there relaxed and talked about how we sold at the right time and bought the other house early so we lucked out both ways. Then buyng a car for 25K, explained before they asked getting a car from enterprise rental, got a good deal on the car, hoping it lasts 12 years, etc, they definately take your picture and check with someone else to make sure everything is on the up and up.
And anyway I understand losing patience but it is a Pandemic and everyone is working short, I think we are lucky anyone will work in these conditions.