Anyone with experience in short sales and REO's know the bank requires proof in writing that the buyer has the necessary funds for the purchase of the property. If the buyer is paying cash I have always advised them to obtain a letter from their bank stating they have the necessary funds for the transaction.
In a recent short sale where I had the listing, the buyer submitted a letter from his bank signed by the Vice President of Banking which included his contact number and email.
The negotiator with the bank would not accept the letter as proof of funds and asked for a copy of the buyer's account statment. His reason was the wording "access to cash currently on deposit". He said the buyer could move these funds from this account into another account at any time. I responded by saying the buyer could still move funds from an account after he gets a copy of the bank statement. He simply said "A bank statement would be different".
I understand an actual copy of the bank statement is a harder proof of funds, but if there is any issue, the negotiator could call the Vice President and get clarification. If the letter was truly a fraud then what would be the end game? Not closing? I don't understand why banks are making the process more difficult than it has to be. In this case, it ended up being an acceptable offer and went to closing.