Did it get merged with another puzzle?
I can't remember, but even if it did I should be able to find my original post by looking through my Own Posts in my profile, and I can't! It's just not there! Also I should then be able to find that car in its other puzzle just by searching for it..
Edit: Now that you mention it, I think this car was also pictured in one of either woodinsight's or barrett's group puzzles, Conundrum or may one of the others. Can either of them remember it?
2nd Edit: I've found the car in woodinsight's #363 Conundrums; it's car No. 5, identified by Oguerrerob in his reply #57.
But there's still no mention of my NEH 1312; perhaps it all got removed because it had featured in woodinsight's puzzle? If I were able to go back in time I'd probably find I removed it myself...!