According to GCD, there were 5 other Fox issues with a publication date of December 1947: Jo-Jo #9, Sunny #11, Zoot #11, All Great #13 and Phantom Lady #15. We have scans for all of those except the All Great, and all of them have the same last page, ibc and bc. I think it would be a safe bet that Blue Beetle #51 has the same ibc as the rest of these books. If that is not convincing enough, I just did a quick "mirror read" of one of the back cover scans on Heritage's site, and I can see portions of the Miller and Company ad from the ibc.
So, if someone wants to create a composite scan with the current BB #51 scan, hufflepuffle's two text pages, and the best versions of the Jowett Institute and Miller and Company ads from the books I listed, we will have a complete scan of that book. I would suggest Sunny #11.