There is chatter about Tesla 'de-rating' their resale cars. For example: 75D's listed as 70D.. P85D listed as 85D.
I can only assume this is due to the recent legal issues they have had with range and performance listings on their used cars (or this part of the company is mismanaged and uninformed - both options are plausible)
For example: look at this car listed as an 85D for $54k
2015 Model S | Tesla
It is actually a p85d - look at the pics.
My conclusion - the only p85d's that will be listed will be actual p90d's... but, if you do your homework, you can find a car like the one above for a great deal