Reference for Bava Metzia 50:11

רב פפא אמר הא והא בכובי וכסי ולא קשיא כאן באשפה העשויה לפנות כאן באשפה שאינה עשויה לפנות

— Said R. Abba b. Zabda in Rab's name: They were tied by their wings, everyone tying them thus. Then let the place [where they were found] be an identification mark. — Said R. 'Ukba b. Hama: It refers to such that can hop. But if they hop, they may have come from elsewhere, and should be permitted!<span class="x" onmousemove="('comment',' Since the owner has no means of identifying them. ');">¹⁰</span>

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