I see Apple has a support article up as of yesterday.
support.apple.com
It doesn't explain why the clear case doesn't work, and doesn't mention 3rd party cases, but does say it has a NFC chip. I have a moment case and am not optimistic it will work, but I still don't understand why. I am not sure how useful find my for the wallet will be (without precision tracking and other airtag like qualities).
About the iPhone Wallet with MagSafe - Apple Support
Learn how to use your iPhone Wallet with Find My.
It doesn't explain why the clear case doesn't work, and doesn't mention 3rd party cases, but does say it has a NFC chip. I have a moment case and am not optimistic it will work, but I still don't understand why. I am not sure how useful find my for the wallet will be (without precision tracking and other airtag like qualities).