This is one of your Ads at Area 51. I just edited the Ad Details so that I could take a screenshot to show you that when there is Edit History, the History link displays next to the edit link (just like it does for Posts, Resources, Media, Comments, Profile Posts etc (standard location).
Here you can see the behavior when clicking on the History link. It does an AJAX insert of the XF Edit History controls (shared template macros).
The haviors are the same for all content types that implement an Edit History Handler. Example, clicking compare versions, launches an overlay that displays the version comparison (again, this is a shared macro that the Edit History handler uses for all content types).
In this screenshot, you can see that I edited and changed things like Price, To Price, Sale Price etc. There should be data in the edit logs for this ad now.
Open the more options... scroll down until you see the link "Edit logs" and click on it (note, you don't have moderator permissions at Area 51, so you won't be able to view edit logs as its a moderator function).
And here you can see that there are 4 logs entries pertaining to 4 price fields.
In this shot, I did another edit to a couple other fields.
Sounds like this is what you are looking for, but let me know if I am way off base (I usually am lol)