I believe there is a 4th color Boss 302. I came across this one on eBay and it was listed as one from a multipack. I do not know enough about hotwheels to fully fill out the table on the main page, but I'd like to make people aware. I have all 4 color Boss 302s if anyone wants a group shot.
Link to eBay page - http://www.ebay.com/itm/370859535324
I can do that when I get home from work.