I was cleaning my bike and a gust of wind knocked my wheel over which had been standing up against a wall. I found the cassette/freehub detached from the wheel. The end caps don't appear to have a thread and I wonder if this is okay, as everything would be held in place when the wheel is placed on the bike. Could someone confirm?
For reference, the wheel is a Reynolds AR62.
I've uploaded a demonstrative video to Imgur, here