Selling rental house to tenants

[Teri Young]

I just sold my rental to the tenants who are living there. Escrow has closed and the tenant sent me a message about a refund for partial rent (they paid for the full month- but escrow closed on the 12th) and they asked about the refund of the security deposit.

I obviously did not do a move out walk through, as they did not move.  They live there.  What are the rules for refunding deposit without walk through in this situation?  Rental house is located in California

Thanks!