Lost Guide in Trapps Lot.

I was climbing at the Trapps last Wednesday (11/20), and come that night I could not find my Grey Dick guidebook. Searching my memory, the best lead I could think of was that maybe I placed it on the top of my car...and then drove away. I know, I know. I was at my car at about dusk 4:30-4:50 but there were still some other cars in the lot. I returned later that night and could not find it. If anyone was there that day and has any information, it would be much appreciated. My best guess is it could be anywhere between the lot and camp slime via the main car road. Thanks in advance for any help.