The owners of a Schaumburg appliance shop can sue Best Buy for allegedly failing to remit sales tax on appliances, even as state conducts its own investigation into the retailer, a state appeals panel ruled Tuesday.The 1st District Appellate Court found the Illinois Department of Revenue’s audit of Best Buy’s appliance sales and a later review by the department’s Informal Conference Board were not adversarial enough to prohibit plaintiffs Richard and Ralph Lindblom from pursuing their qui tam claims …