"wear"-ing a HUD attachment causes currently worn attachment in same attachment location to disappear from inventory. In this case, an AO loaded with purchased animations - all disappeared from inventory never to be seen again. This happened to me in 2 different sims in 2 different ways. Both times I was wearing the ZHAO-II AO in top-left HUD attach location. One, by "wear"-ing a radar HUD attachment that defaulted to upper left HUD attachment point - the ZHAO-II AO and it's contents formerly worn in that location disappeared from inventory. Two, by doing a "replace outfit" with a folder in inventory, all HUD attachments were "un-worn" but again a different ZHAO-II AO and it's purchased animation currently being worn as HUD attachment disappeared from inventory. I don't particularly want to try this experiment again, as each time it costs me! I suppose the steps could be followed again to prove my point, with something copiable.