I have a file FULL of receipts. My wife gathered them all for me. I think she was more concerned about being able to remind me how much I already spent on the car, but having documentation for the insurance company is a good side effect. We're also fortunate enough to be members of one of the best insurance companies in the U.S. USAA.
My car's body isn't in the greatest shape and my hood still has yet to be painted, but I don't think people steal cars like ours for their looks. I don't like alarms so I will probably figure out how to set up a few strategic cut-off switches.
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351W 89 Mustang GT Convertible