Olds have a fairly slow/restricted drain back from heads, opened up more for those who use HV pumps. Of course, that amount of oil would be finding leaking everywhere and from valve covers and main. Does it look like older oil? Can be hard to say, generally car dealers with give them a fresh set, especially if they know there's an issue. How about under neath, caked on with loads of old dried oil, or fresh weeping only? Look like chassis has been blasted for tidy-up? Perhaps they checked the oil with it running! Hopefully, a simple (not sure how) error and that it only exposed the mail seal on the way out anyway.
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