I've posted this over on the Mabi subreddit, but I figure you guys might be interested as well.
I've been collecting data on Alban supply boxes in hopes to determine the drop rate of mats and other items. So far I've got a decent sample for Intermediate and Basic Supply Boxes, but haven't gotten around to using my advanced seals yet.
If anyone else wants to collaborate, I can send out invites for edit privileges.
Methodology for adding is obvious:
-Either set the number of boxes you're going open beforehand, or simply add every box you open
-Add every item that pops out
-No 'after the fact' additions (if you opened 30 boxes yesterday when not recording data and got a mat, don't add that. It may be interesting, but you're adding bias by selectively reporting interesting data)
Price column is not serious, just for playing around with at your own discretion, and the Upper/Lower bound columns give the 95% confidence interval for the drop rates. A majority should be fairly close to their observed rates, but almost all of them will fall within the bounds.