A pal who does actually does know some Special Forces dudes gave me this for Christmas. What a cracking gift!
This is an ammo box for 7.62 mm blank rounds. I guess these are for training sessions prior to live missions.
All I need to do now is think of something cool to keep in it and a convincing back story about my time on a deep mission in the middle east gathering intel' and zeroing in on CIA targets.
Thanks to the kind fella who wrapped it up for me.