Well, I’ll post here for posterity…
INPIDetail and INPIHeader have the data we need.
I joined InventoryItem to INPIDetail by Inventory ID
Then I joined INPIDetail to INPIHeader by PIID and SiteID (might not need Site ID)
This will show you every count by the LOCATION. If you just want to know what the last time the item was counted regardless of location, just group by ItemID and use =max(CountDate) from the INPIHeader table.
This really SHOULD be a stock inquiry somewhere, but I can’t find it, so I built my own inquiry. Cheers my friends!
Thank you for sharing your solution with the community @Michael Hansen !