Related על בבא מציעא 43:13

A thief who took from this one and gave to that one—whatever he took is taken, whatever he gave is given. A robber who took from this one and gave to that one—whatever he took is taken, whatever he gave is given. If the Jordan [river] took from this one and gave to this one—whatever it took is taken, whatever it gave is given. If a river carried off trees, stones or beams from this one and gave [them] to this one—if the owner despaired [of getting this property back] then they are his [the finder's]; but if the owner is in pursuit after them, or they are in another place [and thus had no way to know that their property was carried off by the river], then they belong to the owner.