1 Answer

1) How long ago did this happen? 2) If it was deposited into the account, someone might have had the account number, unless the depositer said that he/she wanted to deposit $ into "so and so's account but didn't have the account number and just gave the name. When you give someone/company a check, the account number is on the bottom.  3) Did your friend do a good deed and is being repaid? 4) Is your friend owed money?5) There probably is a paper trail, starting at Chase. 6) Do an internet check,; maybe query " unknown bank deposit". 7) Contact the Attorney General, and give them the information.8) I put on my "criminal's hat": Maybe this is an extortion attempt. A letter to whomever deposited the $ makes up a phony letter, has your signature phonied, and in the letter, you supposedly ask for $ "or else". Out of fear, the $ is deposited into the account and  the authorities are notified, and your friend is the recipient of an extortion action 8) Don't withdraw the money unless you know the source and that it's legitimate.' (THIS ANSWER HAS BEEN AMENDED)