Old IBM magnetic media

Just received my latest eBay purchase. 5 3850 MSS cartridges. 3 of them had no tape inside. Just wondering why. Data destruction? Inquisitive previous owner? 1 of them has an opaque yellow shell instead of the smoked clear plastic. Possible CE cart? Has magic marker printing on it BAD MSS TAG I thought it took 2 of these carts to restore a 3330 disk. One of these carts has a label on it with 'Data Management Conference October 19-21, 1982 San Jose, California. Me thinks the cart was given out as a souvenir. I was also wondering what old mainframe magnetic media cost back in the day. 2311, 2314, 3330 packs. 2314 Data Cell and a 3850 MSS cartridge. And a 7340 tape cassette. I was on a business call to Yellow Cab in Chicago in the early 70's. We entered through the garage and there was a pile of 2311 packs there. They had just installed a 2314 system and the 2311 packs were being thrown out. I asked if I could have an old pack. I chose a yellow 3M pack. Still have it. :)