Originally Posted by kojaku

By the way, just as a reminder for those that use the gift box to hoard as well, remember that it has a capacity of 100 items (specially rightbefore event's endings). I was about to lose some quest rewards due to being lazy to claim some of them. It's at 85 right now with the daily rewards claimed, though xD

That is not true. Well, not entirely. Gift box have pretty much "unlimited" capacity, but
1) You will only see your 100 top items. Ones pushed beyond this window are still there, but will not be accessible until you remove enough top items to bring them in that last 100
2) All items in present box have expiration date of 1 month since acquisition. So if you let them lie in your box for too long, they will rot and disappear)