Darien Stop & Shop customers who used one of the self-checkout scanners may be the victims of identity theft, the grocery company has announced. Someone illegally installed a skimming device (or “skimmer”) at that register at the Stop & Shop in the Goodwives Shopping Center at 25 Old Kings Hwy. North. The skimmer was attached for five days at the end of last month — from April 26 to 30 at the Darien store, according to the company. If you may have opted for self-checkout at the Darien supermarket from April 26 to 30, you may want to check the account of any card you may have used to see if there are suspicious transactions, the Stop & Shop announcement said.