I earned two of these running some IC quests. To my disappointment, while my level (44 at the time) was high enough to complete the quests, the reward containers themselves are the ESO equivalent of a pickle jar, and I just don't have the wrist strength to pop 'me open. You have to be level 50.
I was dismayed, and ran to the bank to deposit said boxes for another six levels. That's when the real "slap in the face" happened. Can't bank 'em either?
So, I now have two hard-earned Tel Var boxes that will occupy my inventory space for six levels, and there's nothing I can do about it.
Bad design. Please fix.