 Rabbi Meir taught that the finder was obliged to announce it until his neighbors could know of it.Rabbi Judah maintained that the finder had to announce it until three festivals had passed plus an additional seven days after the last festival, allowing three days for going home, three days for returning, and one day for announcing.A Baraita cited among affirmative precepts not limited to time those regarding returning lost property in the dismissal of the mother bird in and the building of fences around accessible roofs in 

Rava taught that “And so shall you do with every lost item of your brother,” serves to include an obligation to protect one's brother from the loss of his land.