Anyhow, other than the mount you see the highest one is 19.5% drop rate for the 50,000 gold followed by Mahra x 2 and Runestone x 2.
The Soul Crystals and Fate Stones x 100 of course have low rates of 1% and 0.5% which is not surprising.
And finally the event item, the Eggshell has a high, 48.5%, drop rate which is actually quite similar to the previous month's event item. So let's say roughly 50% of the time so far from the casher box you get the event item.
UPDATE:Added some more boxes
Changed balen value per box from 49 to 39