As long as those are original sheets, I say it is totally different, and not wrong like the sale of trim tags at all. How is buying a tank sticker that isn't for ones car considered wrong. The most you could ever do with it is display it with your car, but really with no point IMO.
10-15 protecto plates sell on eBay every week, sometimes I see original build sheets, window stickers, invoices etc stuffed in with the POP and owners manual for whatever reason. Is the sale/purchase of stuff like this considered wrong? I don't think so. The most you could ever do with car docs for another car is not a lot at all. If anybody, this is the guy you need to watch out for.
http://cgi.ebay.com/ebaymotors/1967-71-C...1QQcmdZViewItem
Steve
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Steve
68 SS427 Custom Coupe 427/385/M21/3:73
68 Impala Custom Coupe 427/425/M21/3:73
68 Biscayne 2 Door 250/3 speed
68 Caprice Estate
68 Camaro SS396 4 speed