The Better Business Bureau is warning you about strange magazine mailings showing up in mailboxes in Oregon and around the country. Spokeswoman Kyle Kavas says Liberty Publisher's Service, Inc, of Medford and White City has racked up more than 130 complaints in the last year.  Kavas says they're hard to track down, because they operate under more than 50 different business names. To protect yourself, check your previously paid invoices to see if you've done business with that company before contacting them.  If not, avoid responding to inadvertently accept new subscriptions.