You're a good man. Bless your soul, brah. I thought I was the only one who left boards on the road accidentally while packing up to leave. Good thing it hit me ten minutes later and was still there. Hope this guy or his friends see this.
Glad to hear there is good people in this world still. Usually people would spray paint it or something. Good on you. As others said, hope this guy will see this post and get the board back, as well as reward you in some way.
Same thing happened to me a few years ago in North Jersey. A kind person who worked at the shop in Sea Bright picked it up and kept it at the shop. I posted up on this exact forum and the connection was made in less than a day. As someone who has been on the other side, good on you!