I remember when Keith Contarino came on the boards, years ago, and said that he returned the Showcase 34-36 and Brave & Bold 34-36 back to Tom, because they were supposedly not high grade enough for Keith's tastes at the time!
I'm paraphrasing the conversation here, but I think it went something like this:
Keith: "I did a dumb thing and returned the Showcase Atoms and Hawkmans back to Tom because I thought they weren't high enough grade"
linmoth: "Keith, what were you thinking?"
Keith: "One of my biggest regrets in collecting"
tth2: "Keith, what were you thinking?"
Keith: "Ditto"
From the Heritage archives, here is the WP Showcase 34 (not mine)