Reference for Yevamot 230:3
סבר רב חסדא למימר היינו שני תלמידי חכמים ולא אמרינן הנך אזלו לעלמא והני אחריני נינהו
Raba, however, said to him: Are [the two cases] alike? There, the identification marks were given; but here, what identification marks can sesame have! And in regard to [the depositor's] statement [that their quantity] was such and such, it might be said that the similarity of quantities is a mere coincidence. Said Mar Kashisha b. R. Hisda to R. Ashi: Do we ever [in such circumstances]<span class="x" onmousemove="('comment',' When an identification mark exists, such as a letter on a cask or, as in the case of the sesame, the identity of quantities. ');"><sup>7</sup></span> take into consideration the possibility that [the contents of a vessel] may have been removed?<span class="x" onmousemove="('comment',' And replaced by similar contents. ');"><sup>8</sup></span>