The problem with buying games is making sure that everything is still in the box. Usually a quick glance on the scene is enough to inspire buying confidence, with a more in depth check later.
Puzzles are another story. I usually stay away from any puzzle that isn't sealed in the box, because it's too hard to make sure everything is there. I don't have time to count out 500 or more pieces. Who does?
The other day I got offered a couple of vintage puzzles for free. I was waffling a little--free is always a great enticement--when I looked at the box for one of them.
That was all she wrote. Could you turn this guy down?
I know I sure can't.