I once left a small tablet (8") in the Hilton Tokyo... I missed it later in the trip but didn't really hunt through things until at the airport on the last day. I emailed right away, and they said that yes, it had been found by Housekeeping, and that they could post it to me if I covered the postage (and going Japan->US, the postage was actually pretty small, something like $15 for FedEx, whereas the same package going US->Japan would have cost me closer to $100 to send).

My wife left her cell phone in a room in a nice hotel in Barranquilla, Colombia. Never seen again; our local guide spoke with the hotel manager, but no one reported finding it.

And we once left a couple of homemade scarves and Valentine's cards in a Hampton Inn in ABQ... inquired, but they never turned up. I was a bit surprised someone just kept a couple of crocheted scarves.