After all this time, would the ME be able to tell if the remains had been moved (e.g., buried, dug up and placed where they were found to be discovered by someone)?
ETA: In particular, if the remains were moved in the last month or so?
I belive, yes, they can tell if the person passed away at the location where they were later found.
Search and Rescue personnel often miss someone's remains, because it's a needle in a haystack. They have to cover a large area of ground in case the person may have gotten turned around and kept going in the wrong direction. In this case they didn't know where he left the road or in which direction, so , say, trying to cover an area of a dozen square mile of undulating and forested terrain, that's almost 40 million square yards. Rather than looking behind every tree and bush, they have to use probabilities and just look in the likiest places.