Don't try this but in case you wanted to know

I bought a non-running pick up a while back that had a cap and a drop in bed liner on it. When I went to look at it I checked the cap to make sure it had some kind of clamps holding it down. Between then and when we went to get it the seller removed the clamps and did not bother telling me. We got home with it and the wife looked at me with that baffled look and asked "There was a cap there when we left, correct?".....