For me (Xbox) the weapon trinket and the smg “letters” were swapped. So while it said I was getting a trinket, the smg weapon card was displayed and that’s what I received. The trinket said it was the smg, but wasn’t. I also had duplicate trinkets, so be careful what you delete.
I also was able to claim one on an alt, scaled to their level. So it might be available for all characters for a the next few weeks. I’m not sure if it will level up if unclaimed. I guess I can do a quick test.
Yup, it will keep up with your level. I logged in with a level 1 and saw the mail for a level 1 smg. Got to level 2 and checked the mail, level 2. So, you have some time to level up a new alt, if you really want it. Or you can probably trade for it. It’s OK, but there you go. Now I wish I hadn’t picked up the weapons on my level 53. Haha.