My mom found my old metallic blue 3ds in the garage, no stylus but complete with the box. I swear it was broken since I knocked it off a shelf and I remember it not turning on anymore, which is why I got my Pikachu XL one a few years back (and then my Happy Home Designer New 3DS XL this Christmas since the old Pikachu one is starting to show some wear and tear) but surprisingly enough, it works perfectly!
We were originally thinking of trading it in (CeX would give me about £70 for it) but then I realised that the firmware is still 4.5.1 since it hasn't been updated in years, so those Gateway flashcards could still work on it. This makes me think I could get more money for it selling it on ebay as "GATEWAY READY!!1!" as I've seen a lot of people do with limited edition New 3DSes, but I'm not entirely sure....