I do a Google search for companies that match my shipping method (attorneys, financial advisors, small B&B's, photography shops, travel firms, electronics companies, etc). No big name companies that could afford professional letterhead, primarily small businesses, preferably in large building complexes. I drop the suite part of the address, and keep the street number (#300-1234 Main St. -> 1234 Main St.) Makes it that much harder to return.If anyone pursues any cursory investigation, it checks out. I swap out and use a new set of addresses each month