You don't, you ALWAYS check... :-(
Do I retorque the
I actually do check the torque on lug-nuts after going to the tire store. Spark plugs- probably not since if they get loose you'll hear it. The other things- always ask to see the OLD parts that came off.
Back to the original issue- if the oil light REALLY didn't come on, then you really shouldn't have a problem because pressurized oil was always getting to where it needs to be. Nothing is lubricated by "splash" alone in a modern engine- not even those crank seals mentioned in another post. They're lubricated by spray out of the adjacent bearings, which are pressurized. OTOH, with only two quarts of oil the oil being delivered was probably badly aereated even if it was at sufficient pressure.
I think you can reasonbly win the argument that the engine didn't burn off all that oil if it isn't madly burning oil right now. Engines don't "heal." Have the engine checked and see what the damage is, then work through the process with the dealer. None of us can realistically predict how its going to play out, each case is different.