THis has happened to me. I did NOT go in the room. I went to the elevator bank and called the front desk.

Security took me into the room and did a check for me. I also received a call from the manager apologizing etc.

I also had this happen when checking in to the Ren Charleston. Back to front desk where they apologized and give me a new room with no issue. I am certain that it was just housekeeping, but better safe then sorry!
DO NOT GO INTO THE ROOM! GO GET SOMEONE!!!!