Bava Metzia 20: Lost & Found: The Documents Edition

A new mishnah, still on returning lost documents. Beginning with letters that attest to a commitment of obligation or a repossession of property by the court, and more.
Plus, when the matters are not clear and they will be set aside until Elijah the Prophet returns. Also, two towns of the same name - which is intended on a document?! Also, what happens when you find more than one document, whether in a bundle or a cluster? Whom do you return it to, and why?