Is it possible to take possession (make a kinyan) of items which are hefker (ownerless) on Shabbat?

I know that business transactions are prohibited, but i'm unsure whether this applies to any kinyan, or just where it was owned by someone. I also read that you cannot make something hefker on Shabbat, but nothing about taking something that's hefker.

This came up over a silly idea of making some chametz hefker, and taking possession of it on Shabbat, after Pesach has ended in Israel, and consequently being able to eat the chametz.


One may make a kinyan on hefker items on shabbos (R' Akiva Eiger 339:6 s.v. משום מקח וממכר, Aishel Avraham 371:7), provided that he does so in a way that is not evident to people that he's trying to make a kinyan (Shmiras Shabbos Kihilchoso 29:32).

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