Short Term Days of Supply? Trying to figure out this low inventory fee

According to discussions @Jim_Amazon says "the low-inventory-level fee will apply when both the long-term historical days of supply (last 90 days) and short-term historical days of supply (last 30 days) are below 28 days (4 weeks)"

Now I am trying to figure out where the short term historical days of supply are at.

The numbers so far are completely bogus. I put in their algorithm on my excel sheet and it comes up with entirely different numbers. ASIN is 4 months old, only seller, brand owner. Sold 15 in the last 90 days. Have 13 in stock. Historical days of supply is 25.9 and says I need 34 min level. That is insane. According to their system on my spreadsheet, I have 72 days of inventory. Still not what we know to be true, but a lot more reasonable.

So now I am trying to focus on the 30 day number and aside from our monthly sales report, I don't see where Amazon has this information on the FBA inventory system. I need to know what AMAZON thinks the short-term historical days of supply (last 30 days) is. Since clearly our sales and inventory numbers are not what Amazon's system is going by.

Does anyone know where this is at?