A support document published in the wake of the Apple Vision Pro release has made it clear that all you can do with Find My if you lose your headset is lock it down.
Presumably, Apple is relying on the sheer size of the headset and protective cast to insulate against loss. It's a good thing, because a support document published on Friday makes it clear that you won't be able to use your iPhone to find it.
"When you turn on Find My, you protect your Vision Pro with Activation Lock — but you can't use another Apple device or the web to find Vision Pro on a map, play a sound to help find it, turn on Lost Mode, or remotely erase it," Apple says in the document.
It's likely an engineering choice. The headset itself doesn't have a battery. The battery is attached to the side of the headset with a removable plug, and when it's disconnected, there is no "grace period" to swap to a new battery — it just shuts off.
If you do lose it, there's always Activation Lock. That is settable in Find My, the same way you'd lock any other device remotely in the case of loss.
Apple is also clear that users shouldn't take ownership of Apple Vision Pro if it's still protected by Activation Lock.
There's always an AirTag, though. And, there's far more than enough room inside the backpack-sized travel bag that Apple sells to fit one.