At one point I cleaned out a dead mini room. It had matching tape libraries. 9 tracks. Multiple rooms filled with thousands of them. They were contained in full rack size cabinets with vertical sliding metal accordion doors. Simple center bar hangers, but sturdy. Each weighed about 200 pounds. I took multiple pickup loads of the cabinets home. Probable about $50k in original cost. Lined my basement and garage walls with them. Then went to home depot and had a bunch of plywood cut for shelves. Was an amazing salvage.