Well...if they have the GPS coordinates within a few meters, altitude and velocity at time of loss, and wind/weather information, it should be a simple calculation to determine a search are based on newtonian physics.
Still likely a large area, but the bigger concern I would have is the winter weather that have occurred in Greenland since then which likely buried it under ice and snow.
You're six miles in the air, traveling 900 fps and a 10-foot diameter fan spinning at 3300 rpm slings itself to pieces. Those bits are scattered all over hell and half of Georgia. And until they find them they'll have no idea what configuration those bits were in, much less what trajectory they left the airframe on, which stymies your Newtonian physics.
To: 2111USMC
"...Not sure why they think they need to find the parts."
Failure analysis. Would you pay $25 million for an engine that occasionally tears itself apart in flight and no one knows why?
It’s part of a glacier by now. The parts should turn up in about 5000 years.