Historical order lookup failures for users reporting deleted Apple Accounts

Some users are unable to retrieve their historical in-app purchase orders through our order lookup process. These users reported that the Apple Accounts used for the purchases had been deleted. We have not confirmed whether the account deletion caused the lookup failures.
Could you please help us confirm:

  1. Can deleting an Apple Account affect a developer’s ability to look up its historical in-app purchase orders?
  2. Is there an alternative supported method to verify these purchases?
  3. What additional diagnostic information would you need to investigate the affected orders?