This is my view of it....and it's just my opinion so it's probably worth about 2 cents.
I don't believe that casino's requesting notarized documents are standard practice as it has been stated. Seems to me that they would have to be highly suspicious of fraud or some other serious issue before they would chose this extreme route. Think about it......if this was a normal course of events, they know it's going to piss people off. Piss people off = lose business. Doesn't make sense does it?
Oh and let's not forget the OP, his/her original complaint was over $5000.00 and he/she just dropped it......Come on, would you walk away from $5000.00 if you were rightfully owed this amount???? I wouldn't and I might be irritated that I had been asked but I would comply without too much bellyaching, IMO it would be worth it.
If you go to a B&M casino and you win over a certain amount you have to provide 2 forms of ID, and I don't get my panties in a wad over that, why is it soo much different here. After all, it's easier to pretend to be someone else online than it is in a B&M.
Just my 2 cents.