I have had the same experience in the Tyngsboro and Billerica stores. You can use as many coupons as you want as long as they have different codes on them. Some cashiers give them back to you and some don't. My daughter went there twice this week for me. On Tuesday to get 2 items and they kept the 2, 50% off coupons. Today she went for Kona Black, rotary blades and 6 inch square and they gave her back 3, 50% off coupons. Luck of the draw with my 2 stores.