It stands to reason that if an occupying force doesn’t stay long in an area, and its animals die along the way, that the now destitute locals will take the “road kill” and scrounge every possible calorie from it. And marrow was a dish rather than something for soup stock up until the modern era. The Illiad basically won’t shut up about it.
So I have no doubt that every dead elephant anyone could find was 100% rendered down into food and leather by the beleaguered locals. And probably every cousin from one village over got told about the find too. (I suspect elephant leather would make amazing peasant shoes)
I highly recommend reading about what happened from the Carthaginian perspective instead of the typical Roman perspective.
There's also some elaboration on the usage of elephants, the feasibility of of this, and how ultimately ineffective it was for war. (It was great for scaring the enemy, but the issue is they indiscriminately hurt both armies).
https://fallofcivilizationspodcast.com/2023/04/11/%F0%9F%90%...
The latter years of his life must have been very disappointing