So, post the highest number you get per prize to compile rates. I'll update OP with this.
For the 3x BSB (consolation = 1~15 ygg seeds) highest I have seen is 880+ so it's at least 1/900.
Below are the "highest" rate observed.
3x Blacksmith Blessing = 1/900 (highest seen was 880+)
1x Cursed Fragment = 1/300 (highest seen was 270+)
2x Coagulated Spell = 1/60 (highest seen was 50+)
100x Granpa's Speed Potions = 1/40 (haven't observed anything over 40, but got 40 multiple times)
2x Bloody Branches = 1/150 (highest was 150 exactly)
Edited by mildcontempt, 12 July 2018 - 05:21 PM.