I bought them from a random shop, and they didn’t have any cases or manuals just the cartridge in a small case.
I had problems with 2 games i unknowingly purchased a while back /roms/super-nintendo/super-metroid-ju-zst-404801 that were ”fakes”. Another thing i noticed after was that the cartridge shell was a little thicker than normal so when ejecting it would sometimes get stuck. If i played either game for say for than 2 -3 hrs straight it would freeze, sometimes when i would insert it in the ds it wouldn’t read it. When i got home and played them a bit more i begun to notice some problems. I also got to a certain section in the game where i couldn’t access otherwise it would always freeze if i always went in there. I thought that was strange, the pin on the game looked clean, and my ds played every other game inserted. I was playing my Nintendo ds, and the Pokémon game I was using wouldn’t load.