I bought this XA (there was a url link here which no longer exists) last year, it works fine but as you can see its shutter button is missing. It's still possible to fire the shutter and I've shot lots of rolls through this camera over the last year. My planned solution was to place a 4mm O ring around the screw and then cover than in black electric tape. I never got round to it.
Good luck with the sale. If you still have the red button and you want a bit of very high grade double sided tape (to re-attach it), please let me know. The stamps will only cost $1.10 and I'd be happy to send it.
Jon
Interesting. I've never seen what is actually under that little red shutter button. I hope it does sell: these little super troopers — and there are millions in collections and active use, are little gems to play with when walking around town.