> Only one last criteria is lacking. Chris and the other strangers must participate in a "knowing" way. They must be aware that the property involved is criminally-derived.

Another way of saying that is that the only missing criteria is an actual crime. All activity that doesn’t involve crime is non-criminal, so it’s a bit of a leap to imply that something is borderline criminal because one minor detail is absent, with that minor detail being the presence of an actual crime.