So, I've recently realized that the reason I can't find the new banners is because they're made up of different UI assets, rather than a static image. That is, it uses UI graphics and the character portraits to make the new banners. Probably saves on load times, I guess.

I probably should have mentioned this earlier, but a couple months ago, they updated the store layout, and it now uses new banners that are stored externally (as in, I have no way to extract them at all). Since they aren't making any of the old type of banners anymore, that means this folder will no longer be updated...

Mr. C did you can add Vampire Shadow in banners ?

Okay, quick update on this little situation for those concerned, I’ve figured out how to get the new banners. Fortunately, they were archived in my tablet’s data cache, so all banners I’ve seen over the course of the last few months were there. I can only get the HD versions, not the standard versions. I doubt most people will care about the lower resolution versions, but it still bugs me that I can't get them. Also, I can confirm that I got Big’s second banner, but not the first. If I ever see it again. I’ll get it, but it may be lost forever, which really sucks. It's not the best outcome, but it's the best I’ve got for now. Thank you for your patience.