Did the shop remove them? If the sleeves are now proud of the deck when originally they were not, then something is amiss.
Call the shop and ask if/why they were removed.
I have experienced this a couple times. If it's not looked after the sleeves MAY or may not slip into place when the engine heats, so if you mill the deck flat and then the sleeves sink, the head gasket will leak.
If they removed them, they likely tried to press them back. (often what happens) The sleeve top flange outer edges are sharp and when pressed can roll a little aluminum ahead of the flange and even if you heat them now they may not bottom.
The best solution (if you have a gas BBQ or an old oven) is to invert the cylinder and support with some 2x4" steel tubing (or whatever) but not the flange, so the sleeves can drop out. First remove the sleeve bottom o-rings. Preheat the BBQ to 450, place your cylinder on the steel supports and wait for the sleeves to drop. Could take 10 15 mins.
Then lightly sand the sharp flange edges and clean everything, including any aluminum burrs. To speed the process put the sleeves in a freezer for a while. Now cylinder top side up, and on the supports, warm the cylinders to 450 again. With oven mitts on GENTLY let the sleeves drop into the cylinder. Don't let them fall unsupported because the flange can easily crack. Once in place I usually gently tap around the flange top with a plastic hammer to be sure they're seated. You'll hear if they've bottomed.
It will still be a good idea to mill the deck flat after. Install new sleeve bottom o-rings.
