Found black electronic keyboard with some keys intact under the picnic table at Big River Beach, Mendocino County.

I found a black electronic keyboard with a few keys still intact under the picnic table at Big River Beach in Mendocino County. It seems to have been left behind after a music jam session; it has a couple of stickers on the side that say 'Lost In Sound.' If anyone can describe its condition or specific features, I'd love to return it to the owner.