The in game item description is wrong. It states that Memento Mori is 6.83% and Scaraba High Heels is 1.01% but these are incorrect. They're actually reversed. You can see the correct percentages on the wiki page for it here.
I sent in a support ticket about it after I noticed something was wrong when I purchased many boxes, opening many many Scaraba High Heels and zero Memento Mori.
In the ticket they told me they would correct the in game false advertising description but haven't done so yet. That was several weekly maintenances ago now. Due to them not fixing it yet, I've decided to inform you guys myself in case any of you weren't aware yet like me. Don't buy this box expecting Memento Mori at 6.83%!
Also, they did exchange my Scaraba High Heels for Memento Mori due to their false advertising. So if any of you were affected by this, send in a ticket like I did and perhaps you could also be fairly compensated.
Good luck!
