I did this quickly. Didn't read it all. it may help:
https://www.paypal.com/us/cgi-bin/webscr?cmd=_help&eloc=541&loc=527&unique_id=162&source_page=_home&flow=

https://www.paypal.com/us/cgi-bin/webscr?cmd=_help&ui_mode=answer&prior_transaction_id=0&action_code=4&answer_id=8854474&leafid=160&_PPP=511&_PPC=2&_FI=Street_Addresses

How can I confirm an address?

A confirmed address is an address that has been reviewed by PayPal and found to be safer than addresses that do not have similar characteristics. PayPal provides confirmed addresses to help sellers make informed decisions when shipping goods.

While PayPal confirms addresses, there are things that you can do to help PayPal confirm a specific address:

1. Add a credit card to a PayPal account. The address on file with your credit card company will become confirmed for your PayPal account.

2. Apply and be approved for PayPal Buyer Credit. The address used on your application will become confirmed for your PayPal account.

OR

3. Confirm your address through Alternative Address Confirmation.

To qualify for Alternative Address Confirmation, you must meet the following requirements:

1. Be a Verified U.S. PayPal member in good standing.

2. Have been a PayPal member for more than 90 days.

3. Have a Community Participation buyer number more than 10.

If you qualify for Alternative Address Confirmation, you will need to fax several documents to PayPal, after which we will mail a secret code to the address you are trying to confirm. After you enter the secret code correctly into the PayPal website, your address will become confirmed. For more information, please see our User Agreement.

Robert