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Over the past week, illegal credit and debit card skimmers were found at multiple Walmart stores in North Carolina -- and police believe the same group of people is behind all of them. The skimmers, which record the credit and debit card numbers of unsuspecting shoppers when they pay for items they've purchased, all appear to have been installed on November 18th of last year, says Greensboro Police Detective Joseph Harrill. Since then, as many as 300 customers have been ripped off, Harrill says. Investigators believe the same group of thieves is responsible for planting all the skimmers, Harrill says, and they're "confident" they'll track them down.