Very cool post, and great photos. However, in my opinion, you're over-thinking the matter.
If you want to do a diorama of a Panther-turm in Berlin, who's to say that any ONE photo is "more correct" than the other? Who's to say that any TWO photos are "contradictory"? You seem to CLEARLY have shots of both the typical "box" under the turret, and yet clear evidence of a Panther being "buried".
I have come to the conclusion---and this after looking at probably thousands of reference photos of various German armored vehicles taken during WWII---that there were definitely so may variations and degrees of difference between any group of vehicles in a specific category that almost ANYTHING WITHIN REASON is possible to model or portray. Paint schemes, small details like tool placements, accessories, modifications, etc. Many times when someone says "this is how it was", there pops up a photo of a "one-off" or a previously-unseen version that shatters the conventional wisdom. ESPECIALLY in the case of late-war, when everything and anything that could be thrown into the cauldron or jimmied-up from parts was possible to be seen.
If you model a Pantherturm, you have, in my estimation, a wide variety of possible scenarios and options, from boxes to buried panthers, from "D" turrets to late G's. If someone says "Oh, they didn't use THAT!", I think you can ask with a degree of integrity "Were you there?". ;)