TgJ Jer49:10 :אֲרֵי אֲנָא אַיתִיתִי בָלוֹשִין עַל עֵשָׂו גַלִיתִי יָת מַטמוּרוֹהִי‏ : for I have brought searchers against Esau (i.e. Edom) and revealed his hidden treasures
See the entire entry for blwš n.m. searcher, investigator