It is one of the most irritating part of this quest, because it is impossible to check it! That's why I suggest to get even more crates than you need in case when you're not sure - it is absolutely safe, and there are no further restrictions for players with more crates than 10. You can enter to the boss lair even with 15 crates.
Golden Question of July contestJune 24, 2020
Interview with Benjamin Zuckerer - managing director at CipSoftMay 07, 2020
Improving posts is now rewarded with reputation pointsApril 11, 2020
Looking for a community managerJune 09, 2019