That really sucks. Who would steal it, knowing what it is? Probably some ignorant crook hoping for tools or machinery. There's not a large market for stolen sailplanes. Value is likely zero to anyone but a pilot, and what pilot would buy/fly a stolen sailplane. Hopefully it will be discovered abandon somewhere without much damage.
Don't forget to post elsewhere, like
https://www.reddit.com/r/Gliding/. There might be a better chance of recovering it if you spread the word beyond the sailplane community to flying clubs, EAA chapters, local FBOs, or even airport managers. Someone stupid enough to steal it might be stupid enough to take it to an airport to try and sell it.
I've always wondered if a LoJack or Tile or AirTag might help recover a stolen sailplane when trailered.