One important fact you did not include, was there a move in move out check list signed by you and the Landlord? If there was no condition report, the landlord is not allowed to keep any deposit at all. See RCW 59.18.260. Also, the landlord has 14 days to provide an itemized accounting of any deposit that is not returned. See RCW 29.18.280. If these things didn't happen you may be able to recover the rest of the deposit in small claims court.