Reference for Bava Metzia 44:15
ת"ש כריכות ברה"ר הרי אלו שלו ברה"י נוטל ומכריז והאלומות בין ברה"ר ובין ברה"י נוטל ומכריז רבה היכי מתרץ לה ורבא היכי מתרץ לה רבה מתרץ לטעמיה בסימן ורבא מתרץ לטעמיה במקום
How is this to be understood? If [the sheaves] have no identification mark — what is there to be announced [if they are found] on private grounds? It must therefore be that they have an identification mark, and still it is stated that [if found] in a public thoroughfare they belong to the finder. Consequently [it must be assumed that] an identification mark which is liable to be trodden on is not [deemed to be] an identification mark, which is a refutation of Raba! — Raba may answer you: In reality they have no identification mark; and as to your question, 'What is there to be announced [if they were found] on private grounds?', [the answer is:] The place [where they were found] is announced.<span class="x" onmousemove="('comment',' The owner then identifies the lost goods by indicating the place where he lost them. ');"><sup>28</sup></span> But Rabbah says that the place is no identification mark. For it has been stated: [In regard to] the place — Rabbah says, it is not considered an identification mark, but Raba says, it is an identification mark.