I've gone back and forth with support on this issue quite a bit, to the point where I'm starting to feel like I am harassing them, so I wanted to address the issue here.
I've noticed that when I look at my auto-generated report for books, cover images that appeared one week aren't there the next. In particular I have been having a lot of problems with The Destroyer (Pinnacle). Cover images disappeared on one report a while back, so I contacted support and they reappeared on the next report, but now they're gone again. As far as I can tell nothing has changed about the series, and all of the cover images show up on Atomic Avenue. I also checked the latest unrecognized items log file of and they aren't listed.
This has happened for a few other titles too. Should I just try resubmitting the covers for books whose cover images are not showing up in reports?