Normally they do check and see if the rotors are warped before turning them. If a machine shop turned them then it's worth asking about. If a parts store turned them then they may or may not check or be able to check if they are warped. I've known of parts stores that just put them on the lathe and hope for the best when turning drums and rotors.
The thump is a audible noise or something that you feel in the pedal? Hows the wear on the pads and shoes? Does one side look more worn then the other side (left/right side of the car) not inner and outer pads or front and back shoes. It could be the caliper/wheel cylinder not maintaining pressure. Leak in the system somewhere causing pressure loss. Or caliper/wheel cylinder is extended out to max and the pad/shoe is rattling. Could be other things besides the rotor and drums. That's why I hate chasing brake and suspension noises.
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