One memory that has stuck with me:
I was at a show in the Buffalo, NY area. Fellow had a boxed Minitoys trolley on his table at a reasonable price. I put it down thinking it was an odd ball item that nobody else would want. Planned to go back and try to dicker in a little bit.
By the time I got to the end of the row, I decided to go back and get it.
It was already gone!
I have several Minitoys trolleys, but none of them are boxed. I don't think I've seen more than one or two other boxed ones.