Using a formal act of acquisition to take possession of an object on behalf of someone else – works! (Pending discussion whether it really does, and how that connects to the 2 who have taken hold of the talit in the first mishnah of Bava Metzia. Also, the formal kinyan of taking hold of an animal’s bridle – which is complicated when that animal had been the property of a convert who didn’t have heirs. Thus, the real difference between taking possession of something that had a previous owner, as compared to found property.
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