A family member has been told that that Costco will be investigating (looking at videos, etc) and press charges cause he switched price tags. He didn't get caught doing it but at the register a worker peeled off the barcode sticker and asked if he would like to purchase the item, the family member said no. A week later when another family member attempted to buy with the same membership and he was stopped and told that he has been switched price tags (Costco checked their system and saw the same items/barcodes bought repeatedly.) They've threatened that family member into giving information to press charges. Is this considered petty theft? What can they do?