Bermuda Triangle
Objects lost to the Bermuda Triangle achieve a recovery rate approaching zero percent. The Atlantic depths guard their acquisitions with considerable dedication. Deep-sea exploration occasionally locates historical wrecks, but the Triangle's victims generally remain permanently departed. Once something enters those waters under mysterious circumstances, it stays entered.
Money
Lost money demonstrates remarkable recoverable properties. Dropped currency often returns through honest citizens, bank errors occasionally self-correct, and even investments written off as losses sometimes resurrect during market recoveries. The global average of found money returned to owners suggests that currency, unlike aircraft, maintains at least a theoretical possibility of coming back.