Racoons are notorious for their ability to get into places, even containers with a screw-on lid. Make sure to double check your remaining coop for any tears in the poultry netting. Make sure there are no holes in it. You are going to have to rebuild the others. If you build them on the ground, dig a trench all the way round and run your poultry netting/hardware cloth down into the trench at least a foot (two would be better), then fill the trench. That should stop any burrowing predators. I would use hardware cloth for the top. If you build another raised one, use hardware cloth for the bottom. You will need to enclose the run, too. Now that the predators have tasted your chickens, they will be back, again and again, until they can't get anymore food there.
Traps are a good idea, too. Trap the predators, as many as possible, and relocate them far, far away.
Hope your wounded silkie continues to heal. Sounds like you are doing all the right stuff. Sorry this happened in the first place.
Good luck, and keep us posted!