Modular PSU cables never go in the big box. They go back in the PSU box if I'm being smart. Then I know which PSU they came from and can throw them out in ten years along with the PSU itself.
(I'm rarely smart and have a second big box of modular PSU cables that I maybe ought to get rid of.)
(I'm rarely smart and have a second big box of modular PSU cables that I maybe ought to get rid of.)