If you request the lease in writing that may help but it was your responsibility to keep the lease that showed your rights and responsibilities.
The move in check list is governed by RCW 59.18.260 and that means the deposit should not be retained.
The receipt issue is covered by RCW 59.18.270 and you should have gotten a receipt.
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All notices between landlords and tenants have to be in writing. The issue about not having a copy of the lease has cropped up so many times that the legislature has codified it. Pretty sure it is in RCW 59 18 060. And I agree that they have no right to keep your deposit without a walk-thru checklist. There are other additional rules if you are in the City of Seattle. The City has a good website about this. Elizabeth Powell
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