Halakhah for Bava Kamma 205:9
נתן לו את הקרן ולא נתן לו את החומש מחל לו על הקרן ולא מחל לו על החומש מחל לו על זה ועל זה חוץ מפחות שוה פרוטה בקרן אינו צריך לילך אחריו נתן לו את החומש ולא נתן לו את הקרן מחל לו על החומש ולא מחל לו על הקרן מחל לו על זה ועל זה חוץ משוה פרוטה בקרן צריך לילך אחריו
enactment was laid down to the effect that where the expense of personally conveying the misappropriated article would be more than actual principal, he should be able to pay the principal and the Fifth to the Court of Law and thereupon bring his guilt offering and so obtain atonement. And R. Akiba?<a rel="footnote" href="#103b_7"><sup>7</sup></a> — He argues that the Rabbis made the enactment only where he knew whom he robbed, in which case the amount misappropriated would ultimately be restored to the owner,<a rel="footnote" href="#103b_8"><sup>8</sup></a> whereas where he robbed one of five persons and does not know whom he robbed, in which case the amount misappropriated could not be restored to its true owner, our Rabbis did surely not make the enactment. R. Huna b. Judah raised an objection [from the following]: R. Simeon b. Eleazar said that R. Tarfon and R. Akiba did not differ in regard to one who bought [an article] from one out of five without knowing from whom he bought it, both holding that he may put down the purchase money among them and depart.<a rel="footnote" href="#103b_9"><sup>9</sup></a>