This set has no UPS on back of box, typically that would suggest it was an earlier original version, I don't know if that applies here, that being said as far as sold comps it's rare. accumulated some dust etc between the box and packaging as shown through years, another way you can be sure this is original not resealed.
Owner words for Microsoft back in the 80's and 90's
...Also listing a set of WordPerfect Demo, look for that also. & Lotus same era