/diy/ - Do It Yourself

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what is this thing on the ceiling of the closet in my apartment?
would it be a bad idea to pick the lock and open it? just seems odd that they would go as far as to lock it to prevent me from opening it.
There is another one two closets away where my cable hookup and electrical outlet are and I want to turn this closet into a server closet and would like to use it to run cables between if possible