Related for Chagigah 51:8
וכן הגנבים שהחזירו את הכלים: ורמינהי הגנבים שנכנסו לתוך הבית אינו טמא אלא מקום דריסת רגלי הגנבים אמר רב פנחס משמיה (דרב) כשעשו תשובה דיקא נמי דקתני שהחזירו את הכלים ש"מ:
(Mishnah:) And so too the thieves who returned the vessels: (Gemara:) And it is contradicted [by the following Baraita]: "The thieves who entered inside the house, only the area in which the thieves walked is impure." Rav Pinchas said in the name of Rabba: "When they repent [they are believed]." This can also be inferred, as it is taught [in the Mishnah], 'Who returned the vessels.' [This can be] learned from here.
Tosefta Chagigah
If tax collectors entered a house and wrote on the outside [that] everything that is in the house is [ritually] pure, they are believed as to the purity of [articles involved in] the purification rite [of the red heifer], but they are not believed about the purity of Terumah, and in Jerusalem they are believed as to the purity of all the consecrated utensils but not about Terumah, and during the season of the pilgrimmage festival, [they are even believed] about Terumah. One who buys utensils from am ha'aretz skilled craftspersons, and one who sells utensils to am ha'aretz skilled craftspersons are believed about the purity of [articles involved in] the purification rite, but are not believed about the purity of Terumah.
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