AT-ACT Helmet Addon

4.4.17 UPDATE:
Thanks to members of the community, we have been able to identify what this piece is. It is actually the same piece that is on Jyn's helmet during the raid on Eadu.

Original Post:

I designed this back box to fit onto Sean Fields Shoretrooper helmet which can be downloaded at www.shoretrooper.co.uk/files.

The AT-ACT driver is only in the film for about 3 seconds at about the 1:40:45 mark. The design on the back of the helmet is hard to see but there is a black box there. The Black Series 6" figure came out at the end of March 2017 showing more of the details on the back of the helmet but only in a 2D paint application. Based on both of these references I designed this box as best as I can.

This thing was made with Tinkercad.