The same thing happened to me a few years back at the same place. It was raining and I was late for home. I laid a Sage RPL 8' 5wt (made on a blank) and a Pflueger 1495 with new Cortland line up against some black berry bushes and drove off. A half hour down the road, I realized my mistake and went back but it was gone. I put up a sign but never heard a word.
Man I'm sorry to hear that, The only set up I ever lost I hate to say it, was a sage sp and a sage 505L reel and as far as I know they are still at the bottom of lake chopka, They were my favorite setup.