The closest we can come is anthropophagy.
The other question that remains unanswered is whether or not it really is the oldest known evidence of anthropophagy.
There's a skull, between 1.5 million and 2.6 million years old, which has marks interpreted as made by a stone tool. That finding has been disputed; perhaps it's time we revisited that bone.
TL;DR: we don’t know a goddamn thing about fuckall, but we got a bone with some marks on it. Ancient aliens? Sure, why not.