Bava Kamma 66: Despair

How a thief acquires a stolen item, via the thief's changing the item or the despair of the owner that it will never be recovered (the thief still has to compensate the owner for the item). Plus, Abaye's arguments against the impact of despair on the thief's taking possession of that which he has stolen. Also, the difference between a "ganav" (who steals with stealth) and a "gazlan" (who steals brazenly), and which is more likely to cause despair.