Right so developer and reviewer receipts don't use this path: https://github.com/mozilla/zamboni/blob/master/services/verify.py#L99
and neither does a test-receipt https://github.com/mozilla/zamboni/blob/master/services/verify.py#L114. They don't call check_purchase https://github.com/mozilla/zamboni/blob/master/services/verify.py#L91 which is where the uuid lives.