Stumbled across this in the "today's posts" list over on YORF:
https://forums.rocketshoppe.com/showpost.php?p=268384&postcount=2
Lots of useful info in that thread (based on discussing the Semroc kit). But I found in particular this interesting information on the MMI kit:
That sent me down the rabbit hole and I found that Stine himself donated both built
https://airandspace.si.edu/collection-objects/rocket-flying-model-aerobee-hi/nasm_A19930855000and unbuilt
https://airandspace.si.edu/collection-objects/rocket-flying-model-kit-aerobee-hi/nasm_A19850057000kits to the Smithsonian. Pics available for download at the above link.
I poked around erockets, and the decal sheet, fin sheet, nose cone and body tube for the Semroc kit are all available there as of today.