Oh I heard someone lost his because they didn't stack so I never bothered to take the chance of stacking them. There's usually something I want to take with me even if I don't decide until I'm near level 55 again.
Hello again... I am prestige 10 now... And i havent got ANY permenent unlock in all the time i have played.... But i found out something very wierd yesterday... My permenent unlock has used themself!?!?!? When im lvl 3 or under i can in barrack see the thing that they unlocked ?!?!?!