No worries, thank you for the help! Sometimes it helps just to talk through things instead of googling (which didn't come up with a whole lot). I thought it
This might actually fit the issue nicely. Here's some more background:
We've had an issue in our club and the result is that the last manager was fired. As happens, this person tried her hardest to throw a fit, including returning skyboxes that we'd let some of our friends rez. I thought this ex-manager had returned the skybox where I'd parked an alt, because suddenly the alt had fallen from the sky; that is what brought my attention to the box in the first place.
So, if ex-manager returned a skybox, but it ghosted, that would explain the behavior I was seeing. Unfortunately, the person who owned the skybox is afk for a few days so I won't be able to check if the box was returned to her inventory.