Wow! That T needs to be retrained.
I would reassure him that you are not going to take the stuffies away from him. Poor little guy has gone through so much. Talk through the stuffies to see if that helps calm him down, say he no longer needs to see "the bossy lady" (I have a few other names for her). Let him know that you understand that having the toys taken away was very scary. I would probably let him have tomorrow off school (he will be tired anyway) and spend time with him, hugging him firmly may help calm him down (deep pressure helps calm autistic kids and may help in this situation).
Also, you are 7 hours ahead of me, hopefully he calmed down enough to get some sleep.