I do what Cassii described.
When I receive an order, I don’t throw away the invoice because it’s on a sticker. There’s plenty of room to write the name of the toy. Then I cut it, stick it around the cable and then back on to itself. So I have a nice little tag on each cable.
Then I keep all my cables in a cookie-type tin box.
I don’t store the (plastic-covered) cables along with my toys because some materials can react/ melt/ deteriorate if in contact with other plastics.