Not saying these weapons disappear (after all you worked for them) I'm saying that as a food item/weapon they should change into an expired form.
Slightly drop the damage, add a moderate poison effect, as well as a green/brownish aura in addition to a slightly darkened colors.
After all if shooting Nog at enemies is fun shouldn't shooting expired Nog be even more fun?
Have this happen every time Grinchlin Assault happens, and we can "repair them" for a small fee of materials.
Either that or have us be able to "spoil" the weapons and recraft them back to their statusless state for a small fee. Perhaps we craft them into poison versions using spoiled treats and corrosive acid.