Selecting Purchasers from the menu (see above) Takes you to a screen showing which shops have taken your release, and how many they have taken. 

This information is also accessible on the inventory page by clicking on the warehouse icon next to each stock item. 

There is a drop down allowing you to select each of your releases (see above), and also data entry fields enabling you to pick a date range. 

This information is also available as a downloadable CSV