In the beginning perakim of Bava Metzia, there are several mishnayos (see: 1:8, 2:8, 3:4, 3:5) that present cases when there is uncertainty as to who the owner of an item may be, and state:
יְהֵא מֻנָּח עַד שֶׁיָּבֹא אֵלִיָּהוּ
it should remain [ie set aside] until Eliyahu comes
Question
I understand how Eliyahu could explain Torah stalemates (ie if תיקו is an acronym etc) as Eliyahu can reveal and resolve complex halachik questions.
But I assume Eliyahu wouldn't have a crystal ball etc- so how would Eliyahu be able to determine the rightful owner of an object or a monetary case between 2 people?