Stuffed in a drawer/cupboard! So you’re already a step ahead of me!
I tried sorting them once into printable and non-printable, monomeric, polymeric and cast but then you get the complete swatch books which throw a spanner in the works. I also find that they’re all completely different sizes, the pivot point is usually in different places and then you also get some which are supplied on A4 swatch sheets as opposed to books.
So generally i just try and seperate them into printable and non-printable media, and THEN stuff them in a drawer and get them out when I need them.
Unless anyone has a fancy idea??