The missing engraving
So Vince left an engraving in Sheldon's basement which was then taken to the bank by his wife, Mrs Cornpett. How did Vince close the deal with one plate missing? He left it out in case his partners tried to screw him, which they did. Yet everything afterward went according to plan anyway. Sort of. The General was happy with the engravings he received.
"I will not go down in history as the greatest mass-murderer since Adolf Hitler!" - Merkin Muffley