Box and unit has no issues and it is well sealed too. You know that coz you opened without even asking if it’s okay to open and verified yourself and your last question was how to check whether the thing works or not. Unfortunately I can’t tell coz I haven’t opened and tried the thing that is why i described it as new. I had sold it same day and I even helped the buyer to set it up. I suggest don’t waste people’s time next time.