See if there's a film in it and get it developed , you'll know who owns it then and if your lucky they'll pay a lot of money to get the pics back with the negatives.
It could be mine, Its black, made by pentax, has like a lens thing on the front with a little viewfinder that you look through on the back, a string thing so you won't loose it( doh) did I say it was black! and there's a place to put batteries in. Does it match that description?