In a comment on this question Did anyone (especially Yaakov) ever find out about the idols? Ezra says:
In Genesis 35:1-4, Jacob requests his household to hand over "foreign deities", and he buries them underneath a tree in Shechem. Perhaps the teraphim were discovered then, because shortly after this, Rachel dies (ibid. 35:17-20).
Other than this suggestion, do we know what happened to Lovon's idols that were taken by Rochel?