I got a replacement box for my Anakin. I was put on a MIB list, but my shipments still come single boxed. I have been lucky with Kit Fisto, Han Solo, and SDCC Anakin/Vader. I haven't received my shipping notice yet for Mace.
For the replacement box, they send it flat so you have to fold it yourself. It is a little tricky to get it correct. Also, you have to stick it in the original mailer box overnight so it will hold its shape.