I was involved in a very serious car accident in Morocco in the 1980s and after being detained by the police for three days awaiting an interview with an examining magistrate, I made my way back to Ceuta. The border was in chaos and the stamp in my passport showing I had re-exported the car wasn't made.
A couple of years later I was about to fly home from Marrakech after a package holiday when the fact the stamp was missing was noticed. My wife and kids were allowed to board, and the pilot of the plane was very understanding. He put pressure on the authorities by refusing to take off without his missing passenger but even then it took a couple of hours to get the problem resolved.
With the new system with bits of paper, yes, you should keep the white bit indefinitely.
Tim
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
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