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Looking at a 2012 P85 tomorrow

1) Seat does have the secret pocket
2) There is also a seat modification Tesla service center can do to soften up middle bottom of seat... so you sit a bit lower and brings side bolsters more into play. However if this is working for you, suggest you leave it!
3) Auction does not always mean bad things. Trade-in cars often go to auction. However, it would be wise to have thorough inspection by service center prior to purchase... even if they charge you for that.
Dealers unload battery cars like they are toxic waste. Look at carmax they do not have leafs or teslas. That is why they go to auction
Whaaa??? + suspension was ONLY on the P85+, which was an expensive option... never standard.
A lot of the components that started out as P85+ specific parts migrated to the rest of the fleet. The rear control arms and bushings, which provided the biggest P85+ handling benefit and corrected the squirrely rear, were going on to all vehicles by the end of 2013. Vehicles also moved to the same + sub-frames and used nearly all of the + bushings. They definitely diluted the value of the P85+ over time. Lolachampcar has a performance thread that documented the P85+ parts that ended up being installed in all Model S in his search for the ideal setup.

But you're right, some parts did stay + exclusive, like the thicker sway bars.