GREEN BAY, Wis (WSAU) The Better Business Bureau is warning about counterfeit Packers-Vikings tickets for Sunday's game at Lambeau Field. It's not clear how many fake tickets have been sold. Usually the extent of the problem isn't known until game day, when more than one person shows up for the same seat.

Green Bay police say counterfeit tickets have been a big problem for other games -- including the Packers last playoff appearance two seasons ago.

The B-B-B says to buy on-line tickets only from a reputable ticket broker, and not to pay with cash. Authentic tickets also have a Green Bay Packers watermark on the back.