I live 3 miles away from dealership and had the appointment at 6:30am, so it worked out for me. When i reached there, the cabin already had the smell fresh.
I realize that if you take quick sharp turns, you will get the smell in during the day.
They did see soot under the hood and around the coolant and were also able to smell the diesel in the air ducts, filters etc.
I did not make any suggestions to them about the EGR issue, so I am sure that they did their due diligence before going changing it.
Also, they kept the vehicle for 2 days, so they had the opportunity to test it the next morning.