There's also loss of expired gift box items if you happened to be cutting it close. This kind of shit is exactly why they need to let us sort the gift box.

oh shit... better redeem my gifts

giftbox is a second inventory so its good for me
for me i usually use a date 29 per month to take it all

I cleared myself to expiry date 9 September about a week ago taking me to just under 100. I have something like 150 items, with 5 stages to clear in the event. Essentially, I just take Manyus out of a certain colour each day to fulfil the update quests (or Ampies when I have 10) and will keep overfilling the box until about the 7th, when I clear enough of the early stuff to be under 100. Note the expiry date of the earliest items, and repeat for next cycle