Re: SBB + CFF markings on EW and RIC coaches
I remember still seeing the odd coach with the SBB + CFF / SBB + FFS markings as recently as late 2003/early 2004.
I don't recall seeing any on my most recent trip (2019).
Railfaneurope.net has several photos from 2004: http://www.railfaneurope.net/pix/ch/SBB_CFF_FFS/car/EW_I/B/pix.html
EWII were more likely to have been updated, as more coaches were converted to Comfort or Papagei liveries along the way.