Earlier quoted context omitted.
Are you asking me if "End to End encryption" protects the data while at rest on each end? If yes, please do your research on what that term means.
No no! I'm very aware of what E2E means, etc., I'm asking if you have supporting evidence for this statement: > the Find My app itself or other device features almost certainly leack this information to Apple I asked if there was any evidence pointing to this leakage, I'd like to know if it's happened before and I'm unaware of it.
The statements i recall strongly indicated that Apple was aware of many machine identifiers which would have been impossible to log otherwise such as the serial number of the system itself and other such revealing information.
If that is not convincing enough, there are plenty of tales of proprietary, unexposed APIs within the Apple stack itself that "ping home" with sensitive device information, the most recent example being one where any executable on a mac was deliberately blocked (a bug) until validated on Apples end.
If you are looking for a smoking gun, i'm afraid, i cannot provide that, and i apologize if that's what you took away from my comment.
On the other hand, as someone who understands software and the systems here, you may draw your own conclusions, given the two examples above on how hard it would be for someone at Apple, with a bit of motivation and access to do precisely this, ie, derive the information (inferred or direct) about device location through the find my app or other deeper layers of the stack where its stored, or, use the find my network to find devices such as MacBooks that they suspect were involved in activity their security teams dislike.