Reference for Bava Kamma 228:5

אי אמרת בשלמא רבי כגזלן דר"ש קאמר וקני הא מני רבי היא משום הכי קני

in which case the ownership is transferred? Come and hear: IF CUSTOMS-COLLECTORS TOOK AWAY A MAN'S ASS AND GAVE HIM INSTEAD ANOTHER ASS, OR IF BRIGANDS TOOK AWAY HIS GARMENT, IT WOULD BELONG TO HIM, FOR THE OWNERS HAVE SURELY ABANDONED IT. Now, with whose view does this ruling accord? If with that of the Rabbis, the case of the robber<span class="x" onmousemove="('comment',' I.e., the customs-collector who acts openly. ');">⁴</span>

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