Michael's Office

Michael has a few doors taped over like this in his office.  Any guesses as to what happened or what's behind them?  I actually thought it was a practical joke at first (simply because they've done things like this to each other before - I sometimes wonder if they ever got past 7th grade...) but it's not.

Guesses?

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Black mold was found in a few walls and they haven't been taken care of quite yet.