Been there, done that. When I was new to modeling I bought 3 opened kits from one of my LHS. Of the three, only one had tires, and it had only two that weren't even from it. The kits were a AMT 34 ford coupe (The one with tires, no engine block and partially modified) Revell 50 F-1 (I had almost two kits in one box, I was only short a second cab/fender unit and engine), and Revell 37 Ford Sedan (Only missing diorama and tires). More recently, from my other LHS, I bought a AMT 89 Silverado that looked to only be missing a taillight. It turned out to be missing ALL of the stock engine parts, instruction sheet, and probably some other small stuff. I immediately returned it and got my money back ($18 for a kit that needed a donor kit to be built, no thanks). I feel your pain.