Drop box is inside the building, you just need to ask the guard to let you in. He was very helpful. Just keep in mind there is a size limit for the drop box (20"x 12" x 6").
October 2022
5 stars for existing. Door was unlocked Monday at 2pm. Guard was there and helpful. Go up the stairs, make a left at the security desk, through the doors, and make a right and you’ll see it.