Shekalim 7:3-4

Shekalim 7:3

If entire limbs of meat were found in the Temple courtyard, they were assumed to be from burnt offerings; slices of meat were assumed to be from sin offerings. Meat found in Jerusalem was assumed to be from peace offerings. In either case, the meat should be left until it is unfit to eat and then burned. If meat was found in other cities, entire limbs are assumed to be carrion and slices of meat are permitted. During the yomim tovim, when meat was plentiful, even whole limbs were permitted.

Shekalim 7:4

If an animal was found between Jerusalem and Migdal Eider (a nearby town), or the same distance in any direction, males were assumed to be burnt offerings and females were assumed to be peace offerings. Rabbi Yehuda said that animals fit to be used for the Passover offering are assumed to be intended for such when found with 30 days of Passover.