First: Federal Reserve regulations require payor institutions to provide notification to the institution of first deposit when returning items for $2,500 or more. The payor must notify the institution of first deposit by 4:00 p.m. (local time) of the second business day following the day the check was presented to the payor bank.
Check to see if you got notice, if yes, you are dead in the water, if no, you have a case.
Second, you need to file "Bank's Claim of Late Return" with the FRB and they will sort through the mess. That form is
HERE. On the other hand, if you got the large item return call, you may not have a case - especially if the FRB delayed returning the item - you really need to have the drawee bank record the sequence of events to see if they delayed returning the item and to see who they contacted at your bank.