I have often ranted on the subject of the credit reporting agencies' suggestion that you keep credit accounts that you don't use open, so as not to get your credit dinged. Not only do I not think it's a good idea to have loose credit lines hanging around, I find it offensive that we have to do something that, in a rationally-ordered world, would be just plain stupid.
Well, it turns out that we've been had. J and I are buying a new car and our credit has been checked. If closing down the accounts had any impact, it was marginal. Don't worry about it; shut down those unused accounts. I suspect that the reporting agencies charge by the account, so they want us all to do stupid stuff to enrich them.