Expermential weapons

For those of us who had Exp/US weapons and had them disappear how do we get them back. We cannot go back and play the missions that allowed us to pick up the EXP and the US were a paid package. The Exp weapons are hard to recreate to get back but the US weapons were a paid package and should be able to track the paid ticket and re add them or give us a place to pick them up. Just doesn’t seem fair for us on XBOX 1 to be limited to this problem. In all the updates you still have not fixed this problem for us. Heck put them all in a bunker and have us fight our way in or something that we can get results with. The discussion for all the contributers have left us behind. We basically have to start over it seems.