If I did not cause any damage and they cannot prove it, do I have to pay?

The move-in/out forms are matters of additional evidence. The landlord can testify and see if the judge accepts what he says. If he shows a picture of a big ink spot on the carpet, a door broken, etc., the judge might suspect you would not have moved in if the unit was in that condition. Even though you probably would be the plaintiff [the landlord has already withheld the security deposit money], most judge would put the burden of proof on the landlord to show he deductions are reasonable [which includes estimates for the cost of replacement or repair]. The landlord is supposed to send you within 21 days the reasons for withholding any money, but the code section does not state what the result of a failure to do so is.