I can confirm that Auxilium **IS NOT** performing as we expect. I just had this happen -- plenty of "gold camo" sitting there, I switched tanks in the carousel, NO tanks in battle and the mod purchased new gold camo for all three seasons. And, gold locker was enabled.
This mod can end up being VERY expensive for anyone who keeps some gold hanging around.
I have posted this on the Auxilium NA forum.
Aslain, I would highly recommend disabling the inclusion of the AutoCamo piece of the mod until such a time as this feature is fixed.