When i got off yesterday i had 17 spawners, and one in my chest. Punk had just joined my island that day. W=This morning when i came on and realised slime wasnt generating, i looked at my spawner and realised all 17 were missing. Punk was no longer on my island. When i looked in the chest the other one was in, it wasnt there. I was also missing 5 hoppers and there was a hole in the slime generator viewing area. I think he stole them.
So, I was in GreyCMittens SlimeShop (warp is SlimeShop) area last night buying slimeballs, and took a couple screenshots of the slime spawning area because I wanted a reference photos of how to build a working one. So, Basically its proof that the spawners were there last night, and then disappeared (or stolen) as of this morning.
Yeah, I dont trust anyone with my island. Hopefully someone will help you, But no one helped me, (Just saying, Maybe they might have time to help you....)