$98,000 cash found in desk bought on Craigslist

[mrlynn]

You can bet that with the publicity, the seller on CL will claim the money is his. Unless, of course, as RAMd®d suggests, it's "ill-gotten." I would suggest waiting a reasonable period of time, and if no one comes forth with a plausible claim to the money (e.g. "It was my late uncle's desk, and the $98k is in his accounts ledger—see?"), it's yours.

/Mr Lynn