Lost Russian Blue Cat in Concord, MA!

Missing cat in Concord, MA! Our beloved Russian Blue cat was accidentally let out of the house around 11:45AM on June 22nd. He was last seen near our home on Nut Meadow Crossing in Concord (a small street off of Old Road to Nine Acre Corner). He is completely gray with green eyes and weighs 8 pounds. He is shy at first, but very friendly. He does not wear a collar, but does have a microchip.