Related for Bava Metzia 42:5
(סימן פמג"ש ממקגט"י ככסע"ז)
Raba says: It is an abandonment, because when he becomes aware that he lost it he gives up the hope [of recovering it] as he says [to himself], 'I cannot recognise it by an identification mark,' it is therefore as if he had given up hope from the moment [he lost it].<span class="x" onmousemove="('comment',' The 'abandonment' is deemed to have a retrospective effect, and this entitles the finder to acquire the article. ');"><sup>9</sup></span> (<i>Mnemonic</i>: PMGSH MMKGTY KKS'Z.)<span class="x" onmousemove="('comment',' Mnemonic consisting of Hebrew initials of the teachings that follow. ');"><sup>10</sup></span>
Tosefta Ketubot
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.
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