Roger - I do the same thing. I choose to leave the plug in the oven as it cools, because I truly suspect that the closed oven would maintain a very, very dry atmosphere inside as the trapped air cools.
I used to take out the hot (200C) plug after the 4 hours and wrap it quickly and loosly in aluminium foil - and pop that into a sealed ziplock until cool. I now don't see the point of it.
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