In my characters vault, the number of delivery boxes does not match what the game thinks I have!
I had one box.... The game thinks I have none!
I buy a new box, I now have two..... The game thinks I only have one!
I had been away from the game for a while (several months? a year?) , came back, deleted a character, added a new one, and then tried to transfer level 10 gear to them, would that have made a difference somehow?