Because repacks run locally without Steam server verification, modifying your inventory numbers is highly effective:

I will cite the sources I have found: for general commands (weebly page), for admin commands (Steam discussion, GPORTAL wiki), for enabling console (Steam discussion), for cheat engine (FearLess page), for save editing (GitHub). I will also cite the repack definition from Wikipedia.

Repack users often use these versions for testing or photography due to the ease of access to files.