Onebadopel,
It's not what your NOS sheetmetal is worth if you sell it, but what it will bring. I've seen stuff, as I'm sure you have, that didn't receive the minimum bid in the first listing but easily exceeded it in the second listing. I bought an NOS Manta center grille for $75 shipping included when it didn't receive the opening bid of $99.99. I thought I was going to pick up the side pieces in separate auctions from a different seller at the same time for even less.
I listed an NOS Kadett Rallye muffler for $125 about two weeks after seeing one sell for $175. Two of the losing bidders went more than $150 and I emailed them to make sure they saw my auction. IIRC none of the bidders of the first auction bid on my auction.
A New Zealand list member who wasn't even in on the first auction won the auction for $127.
Harold