Page 64 of Tiger I On the Eastern Front has a picture of 221 during Zitadelle that shows the second added stowage box and on Page 62 223 seems to show one although the main box is hidden behind a crew member. In Operation “Citadel” by Restayn and Moller there is a great rear 3/4 view of 233 with the bin and the wire and a colour profile of it in the profile section.