Hi, check them one by one and don't see that I work more than half an hour to see them all. They are ALL in MK3 and Full
Apart from that they could also put a warning, or signal in the box before opening it (it could be a green star) when the weapon is full MK3.
One more idea... did you upgarde weapons which were part of some events?
I didnt get 80 blueprints even I had like 85 blueprints... it somehow didnt count those which were received or bought in shop.
I got the badge after upgrading exactly 100 different weapons to max level. They included Terminator weapons, Ubisoft Club reward weapons, and weapons from the store.
I had all 100 guns in my loadout when the badge popped.