Reference for Bava Metzia 52:4
איכא דאמרי אמר רבא אע"ג דלית ביה אלא שוה שתי פרוטות חייב להחזיר מאי טעמא אימור שותפי נינהו וחד מנייהו אחולי אחליה למנתיה גבי חבריה
for each [of the three]; but if it contains the equivalent of a <i>perutah</i> for each person, he is bound to return it. What is the reason? They may be partners, and therefore do not abandon it.<span class="x" onmousemove="('comment',' When one discovers the coin gone, he thinks that his partner may have taken it as a practical joke. The stranger therefore picks it up before abandonment, and so must return it. ');"><sup>3</sup></span>
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