Sorry EL. bad luck.
If AM&S valued your bussiness or any one else they will take care of it. Why not have AS&M claim it on there insurance, it was on there lot.
As far as disclaimer about not being responsible, there are loop holes to that. Your property was on there lot with permission, they are liable . D o you know how many people sued the city of Seattle when they got hurt from falling debries from the Kingdom, quiet a few and they did win the case; on the back of the sporting events tickets has the same disclaimer saying they are not responsible for damage to property, theft loss ..etc..........

You do have a case against them because of liability. Harm, damge theft.... was done to you because of negligence ie (faulty gate, lock not working cameras etc.......on and on.

Don't let those disclaimers scare you off in thinking you are up **** creek.

Please let us know what happens. If they mis treat one customer then they are likely to do it to others which = bad bussiness. If they don;t take care of you, take your bussiness else where and I am sure many others will do the same on here.

Good luck in getting it resolved.