Jerusalem Talmud Beitzah 5.6

משנה: בּוֹר שֶׁל יָחִיד כְּרַגְלֵי יָחִיד. וְשֶׁל אַנְשֵׁי הָעִיר כְּרַגְלֵי אַנְשֵׁי אוֹתָהּ הָעִיר וְשֶׁל עוֹלֵי בָבֶל כְּרַגְלֵי הַמְמַלֵּא:

MISHNAH: A private cistern is like the feet of the individual, but one of the townspeople is like the feet of the people of this town, and of the pilgrims from Babylonia like the feet of the person filling.

הלכה: [בְּאֵר] שֶׁבֵּין שְׁנֵי תְחוּמִין. רִבִּי יוֹחָנָן אָמַר. עוֹשִׂין לָהּ מְחִיצָה שֵׁלְבַּרְזֶל. רִבִּי יוֹסֶי בֶּן חֲנִינָה אָמַר. אֲפִילוּ מְחִיצָה שֶׁלְקָנִים. וּבִלְבַד שֶׁלֹּא יְהוּ [הַמַּיִם] נִמְשָׁכִין לְכָאן וּלְכָאן. אָמַר רִבִּי יוּדָן. הֶחֱמִירוּ בְדִבְרֵיהֶן יוֹתֵר מִדִּבְרֵי תּוֹרָה. אָמַר רִבִּי חֲנִינָה. וְלֹא מִין בְּמִינוֹ הוּא. אֶלָּא הֶחֱמִירוּ בְדִבְרֵיהֶן כְדִבְרֵי תּוֹרָה.

HALAKHAH: [A well] between two Sabbath domains. Rebbi Joḥanan said, one makes an iron wall for it. Rebbi Yose ben Ḥanina said, even a partition made of reeds, on condition that the water not flow in both directions. Rebbi Yudan said, they were more strict with their words than with words of the Torah. Rebbi Ḥanina said, is it not {mixture of} kind in its own kind? But they were strict with their words as with words of the Torah.

הָדָא אָמְרָה. הַמּוֹצֵא כְּלִי בַדֶּרֶךְ הֲרֵי זוֹ כְרַגְלֵי הַמּוֹצֵא.

This implies that if one finds a vessel on the road it is like the feet of the finder.