I assume you're talking about "Matchbox Mystery"? I had the same problem and was busted by my Sunday School class because of the sound, and because it didn't close all the way. I should have watched the video first, because as soon as I took a Q-tip with some vegetable oil and touched up the contact points, the problem was solved.
I then fooled my wife and both sons, no small task as they have all been conditioned to "think like magicians" over the years.
Answered at 09:17am on January 16th, 2014 by cpnich (90 karma)