Rachel thinks that her father Laban sold them and stole their value, so she stole the idol and can get her value back later. In order to ensure the inheritance rights of his sons, Laban hurriedly took back his idol. Finally, the idol was not found, and Laban asked for a Covenant with Jacob not to cross the stone pile to inherit his inheritance.
It turns out that the idol, like the deed, is related to property inheritance, which proves that the records in the Bible are really reliable.