Reference for Bava Metzia 203:24

א"ה אסורות בגזל מפני דרכי שלום אי דשלחה גזל מעליא הוא אי דלא שלחה הא בעי שלוחה

and are forbidden as robbery, [but only] for the sake of peace.<span class="x" onmousemove="('comment',' I.e., strictly speaking, they are ownerless, being semi-wild; nevertheless, for the sake of peace, the Rabbis recognised the title of the owner of the dovecote, and so another must not take them. ');">²¹</span>

Jastrow

Jastrow

Rashi on Deuteronomy