An Update to Nikon D600

I got my D600 sensor cleaned. At that time I thought that I had got it back only cleaned''and not with"the  shutter replaced.
Asked the techgnician at the Nikon service centre who assured me that the shutter had been replaced. I was not very convinced. Now after a few months of shooting, the sensor remains clean and pristine ( lets hope it lasts!)
I think it did get replaced.