"Confirmed paypal only" is part of my boilerplate in sales threads. Part of the "verified" status is a confirmed address. IE the address on file is known to have worked in the past and/or the account holder has proof that the address is theirs via confirmation. It's that simple.
Never move forward if a person doesn't have a confirmed address listed with PayPal. It's an obvious red flag. Never work with people who, for whatever reason, don't have accurate and up-to-date PP account info. PayPal will not take responsibility for any failures linked to inaccurate or out-of-date address info. It's in their policies.