Just found a professionally produced color film of spectators being interviewed at the 1967 Chicago Auto Show and in the background you can see what has to be the same 1967 Camaro Z28. It has the same "Z-28" rear license plate and rear spoiler. Unfortunately you can't see if it is wearing the same aftermarket wheels.
Tell me what you guys think but I believe the color film shows that the car was painted white. Notice the difference in the color of the Z28 compared to the tan collar on the jacket of the interviewee.
This event took place Saturday, February 25th through Sunday, March 5th, 1967 at The International Amphitheater in Chicago, Illinois, more than a month earlier than the New York International Auto Show.
See it at 01:53:06 here:
http://www.historicfilms.com/search/?q=1967+chicago+auto+show#p1t6010i0o823I think this confirms that the non-RS Camaro behind the guy standing between the two convertible "Dream Cars" in the 3rd and 4th pictures is the Z28. This was also taken at the 1967 Chicago Auto Show.