Customer Support Team
As these items are designed to have both negative and positive results, many players may confuse a string of negative results as a bug. However, we have tested these items regularly and have found that they are working as intended. Due to this, we can offer no compensations or returns once you've opened a box or enchanted an item. Results of such instances are all final and cannot be reversed by the Customer Support Team.
If you wish to express your opinion on this system, you may create a post on the forums.