I have a few recollections of this.
The car had no sponsors, other than suppliers like Shell & FAT, so Porsche were paying.
The transporters were the previous years works 911 transporters, with a quick all white respray, and in the right light you could see the works Porsche signwriting underneath
Dauer (has anyone heard of him since) had produced a roadgoing 962 from his old race car, but the cars that turned up at Le Mans for the test day were brand new and all carbon. Porsche had realised that this GT1 car had a better chance of winning than a restricted LMP962. However, they kept a low profile in case they were thought to be cheating
Porsche didn't have a factory team at the time. I hadn't heard of Joests involvement but it makes sense, as he could put something together from the vast number of unemployed British Group C mechanics, many of whom had gone to Germany to work on the DTM
Unpainted carbon - bit of a hurry perhaps