Turned out this lamb shoulder was boneless wrapped in plastic netting which I had not removed prior to vacuum-sealing the bag. I cooked it 24 hours at 160 F, then broiled it for 2-3 min per side to crisp the edges. It was tender and moist. With it I served small yukon potatoes covered with duck fat and a casserole with cauliflower broken into very small pieces, white sauce, lots of onions and two kinds of cheese: cheddar and a tiny bit of parmesan. Thanks Kerry Beal, I'll take note of your times for Bone-in. Delish!