The DS Lite, as most people probably know, comes with a placeholder gba cartridge that nintendo officially calls the "cartridge slot cover". This has electrical contacts on it, though it does nothing when inserted into the system.
I would assume there's nothing inside it besides a blank PCB with the contacts, but I can't seem to find any images confirming this, and I don't have a triwing screwdriver to open mine up.
Can anyone say definitively (with pictures if possible) what is inside one of these placeholder cartridges?