A correctional officer at the intake facility at the St. Louis County Justice Center last week found $55,000 stuffed behind a toilet paper dispenser.
The bundle of money was in $100 and $50 bills, said Clayton Police Chief Thomas Byrne.
Officials interviewed inmates about the money, but none admitted knowing anything about the stashed cash.
The money was placed in a special bank account until the owner can be determined, Byrne said.
