I do not see any valid reason for this and it should be an easy fix

Haven't really played since this was added but I am guessing that it gives you an item from your level range? If that is the case then it would be conceivable that high level items such as 60+ would be much more valuable and thus removing the ability to unlock it. Just my educated guess on it but I will pass this on to find out if it is intended.

Taken from HERE.

To put it short, Items Box is only available for players whose level range is 1-60.
If your player level exceeds 60 (e.g. you're lvl61 player) the Item Box comes unavailable to you.

Oh, Items Box is also unavailable to me since i'm lvl78.

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Aeacus

Makes sense. The current boosts are very disproportionate though.

OMG!!! They delete all our tokens for a reason I never understood, and they compensate us with a gift that is limited and they tell us that at the bug reports under a hidden "spoiler"?

TROLLING LVL: ∞

There is no obvious reason to limit this since there are weapons until level 70 and there should be an obvious warning somewhere since they gave a gift that is limitted...

Lol, the tokens aren't deleted, you still can use them to boost in BattleDawn