If anyone knows the whereabouts of VRT 564 G, a red/white S4 in Sprint colours which was sold at auction recently please contact me with a PM or post a reply on the forum. I have all the old bills and some history which would provide some provenance for the car in the future.
I suggest you contact the Auctioneers & ask them to forward a letter for you.
They may not be able to reveal the client contact details, but will probably forward a letter.