I vaguely remember that at least some USPS service (could have been forwarding) asks for ID verification questions that would be in your credit profile or other

I vaguely remember that at least some USPS service (could have been forwarding) asks for ID verification questions that would be in your credit profile or other databases. UPS also does something similar for their own equivalent, but UPS does send a physical letter if it cannot confirm that the address belongs to you.