Click on image to enlarge.
Since eBay does not (yet) show the seller on search listing result pages, Munnin can only display the identicon after the item description was retrieved or a quick synchronization was performed.
Munnin-Professional, Munnin-Business and Munnin-Enterprise
To see the identicons you just have to activate the automatic data synchronization for items in the item listing window (see image).
Munnin will then automatically show the identicon for all visible items.
If you want to see the identicons you have to select all items in the listing (keyboard command: Strg-A) and execute a Quicksync (keyboard command: Strg-Enter).
These commands are also available through the listing context menu by pressing the right mouse button.
You will only see identicons for sellers after you have retrieved the item description.