daf bit: Bava Metzia 24
That was Monday. The next mishna, on today's daf, considers the other side, saying that the following must always be announced: fruit in a vessel (or a vessel by itself), money in a purse (or a purse by itself), heaps of fruit (that is, it was placed not dropped), heaps of coins, three coins stacked, bundles of sheaves in private premises, home-made loaves, fleeces of wool from the craftsman's workshop, jars of wine, jars of oil. (21a, 24b)
What are the principles at play here? One is identifiability; there is no way to prove ownership of scattered coins and all baker's loaves look the same. Another is intent; items neatly stacked, even if in small quantity, were put there, so we presume that the owner is coming back for them. Another is whether, upon learning that he's lost something, a person searches for it or gives up hope of recovery. (The rabbis say that small sheaves in the public road get trampled and destroyed, so people just accept the loss.)
I expect value to play in here too, but if so I'm surprised that a finder can keep (many) scattered coins but must announce a mere three if stacked, and that a finder can keep meat and fish but must announce an empty purse. But there's a lot of g'mara here that I haven't learned yet, so maybe this is addressed.

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