Related for Bava Metzia 43:3
ת"ש שטף נהר קוריו עציו ואבניו ונתנו בתוך שדה חבירו הרי אלו שלו מפני שנתיאשו הבעלים טעמא דנתיאשו הבעלים הא סתמא לא הכא במאי עסקינן כשיכול להציל
— Rab papa explained it as referring to armed bandits.<span class="x" onmousemove="('comment',' Who commit open larceny, so that the owner becomes aware of his loss at once and abandons it. ');"><sup>5</sup></span> But then it is the same as 'robbers'?<span class="x" onmousemove="('comment',' Cf. B.K. 57a. ');"><sup>6</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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