Also I noticed that only the outside portions and under the lid of the two chests I have had wrinkle paint. Inside the drawers seemed to be normal smooth paint.
My wartime Plomb box is the same - wrinkle OD paint except for the drawers, which have a non-wrinkled finish.
Here's an excerpt from a GJ post by Carla from a couple years ago about paint to match Plomb toolbox OD:
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For the generality of 'minor items', I've used the allegedly 'mil-spec' paint supplied in spray cans from 'Rapco' (Mark Dodd, of Bowie, Texas, do a search for his web-site) He carries the 24052 green,which is a match for the old Plomb tool box green, the 24533 light 'interior green', aka 'cockpit green', the 16081 Navy-spec medium grey, and the 111 red primer,all of which are suitable for general shop use.
(the 24052 green matches Plomb tool kit boxes near-perfectly for colour, but most of the Plomb boxes were finished with a 'wrinkle' paint, so its not a 'perfect' restoration.)
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https://www.garagejournal.com/forum/showpost.php?p=5304676&postcount=14