BWV does not have a lost and found. I was told that there is one general L&F for the entire WDW resort & Parks - over at the Ticket & Transportation center. Everything that's turned in ends up there for a certain amt of time before it's then turned over to someplace else. DD left her camera on a bus and miraculously we found it there.
Most of the time housekeeping will keep or toss what they find, not caring to pass it onto L&F. On occasion they will make the effort to mail it home to whomever checked out (children's toys, blankets etc.) There's a remote chance the calculator may be in the mail now.