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Well,
I hate to disagree with all the paint haters

but
I've personally purchased BBC valve covers and taken them
out of the box ( never opened ) and they were painted orange.
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When I worked in the parts department at the local Chevy dealer in the 80's, one of my jobs was to do the "return." So every month I'd inventory and prepare those parts to be returned to GM, which included making opened packages look like they hadn't been opened. We had all kinds of tricks, including the spray paint that looked like cardboard, finding parts in inventory with similar boxes and swapping labels and contents, restapling through original staple holes, etc.
So, never say "never opened"