Reference for Bava Metzia 50:12

אשפה העשויה לפנות אבידה מדעת היא אלא באשפה שאינה עשויה לפנות ונמלך עליה לפנותה

— One may surmise that they came from elsewhere, but one can also surmise that a person hid them there: hence it is a case of doubtful placing, and R. Abba b. Zabda said in Rab's name: Whenever it is doubtful if an article was left [in a certain spot], one must not take it in the first instance; but if he took, he need not return it.

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