I have one of these left - Kaiser CAT50 KAB6 Modular Tool Holder 11.326.664. In excellent condition - not 100% sure if it has been used or not, but marked as used since it has a sticker on it. Came out of a tool crib surplus.

https://www.ebay.com/itm/Kaiser-CAT5...UAAOSw5gVemHV9