This post made me check Super Mario World thinking I had another huge jackpot I didn't realize but when I looked it up, I was like, "Oh yeah..... she kept the boxes" π
Katt's mention of of Wario Land and Link's Awakening made be check those.... neither of those are worth mentioning, but I noticed a loose cart of Majora's Mask, which I have, is $69.97, one of my more worthwhile ones (when not compared to Jack Bros.)
ACTUALLY come to think of it..... Majora's Mask may have come out late enough for when we actually WERE saving boxes..... I might be able to find the box and manual somewhere..... Not sure though..... Complete in box is worth $197.50.
Just thought to look up my 4 Ninja Gaiden games (3 NES, 1 Gameboy). Ninja Gaiden III for NES loose cart is a very good $97.25, and Ninja Gaiden Shadow loose cart for Game Boy is a not too shabby $68.47.