Repacking NES ROMs typically involves a few steps:

If you download a legitimate "All NES Games ROMs repack" (usually sourced from a "No-Intro" or "GoodNES" collection), here is exactly what you will find, broken down by category.

If you want a legal "All NES Games ROMs repack," you would have to buy every single cartridge (cost: ~$50,000+) and a device like the Retrode or INLretro dumper to extract the data yourself. For 99% of users, this is unrealistic, which is why existing repacks thrive on historical preservation forums rather than piracy marketplaces.