I created a Fotki album for this SSP -
http://public.fotki.com/28HopUp/85-chp-in-new-orleans/
In one picture, it shows the Unit Number as #E408327, but if you look at the VIN on the same page you will see it is paperwork for a different SSP Mustang. But at least if that car ever turns up we will know the car's Unit Number.
The seller says that you can see the patched hole on the driver's side quarter panel from inside the trunk. Apparently there is also a hole in the trunklid for an antenna (a SMPV feature). The interior A-pillar trim are drilled for spotlights. In one picture the owner's warranty card shows "Calif Highway Patrol" as the owner. Carfax is consistent with it being owned by the CHP, so this car was surely a 1985 CHP Mustang.
In one picture you can see 8306 written on the paperwork, so I am operating on the basis that the car's number was #E408306. Once the Assignment Card is found, then we will know for sure if 8306 matches the VIN for this car, and whether or not it was a SMPV. I hope to track down the Assignment Card this week, and will let everyone know what it says.