There is a 2-car batch of VINs on the 1984 page where the first one was confirmed as being purchased by the State or Georgia Department of Revenue, but the ordering agency for the second SSP was unknown despite the DSO number only being one digit off. The first SSP is...
http://www.specialservicemustang.net...info227282.htm
...which again was confirmed as a State of Georgia Dept of Revenue SSP. The owner of the second SSP provided a photo of the asset tag in the glove box, and this car is also a Georgia Dept of Revenue SSP -
http://www.specialservicemustang.net...info227283.htm
The asset tags are sequential as well. Pretty cool!