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I'm having a niggling thought, something I've read about on other cars--where a gasoline seal ruptured and poured gas into the crankcase. Made it look like the oil was overfull, and very thin and runny. If your crankcase was full of gas, that could sneak past the rings or suck through the pcv very easily and cause an over-rich situation. I'd give it the sniff test--your nose should be able to tell if there's a significant amount of gasoline in there. If there is, that's not the oil change people's fault.
If your crankcase is filled up to higher than the cranshaft seal, it will leak and make a mess--and probably drip whether the engine's running or not. Not sure it will really cause any permanent damage unless it's full enough to contact the rings.
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