It sucks when your rabbit isn’t interested in wood toys. My rabbit Bleu is like this as well. Prefer to chew on plastic over the 100 wood toys in her cage.
What I would do but actually didn’t work very long with my rabbit Bleu is I would take Ivory bar soap and rub it on the box and it would deter her from chewing on it for quite a while until it wore off then I would have to do it again. I am pretty sure this is safe, I read it was on a couple sites but if you were to do this, make sure your rabbit doesn’t actually ingest any and if he seems to enjoy licking it then an alternative may be needed. The goal is to eventually make the rabbit forget that it enjoyed chewing on plastic. I got lazy and sick of doing this every week though
Another option, is to get a metal casserole dish or lasagna pan and place it in a deep cardboard box that your bunny can jump into easily. The cardboard prevents your bunny from smacking his legs on the metal and I also use it as a container for hay. Keeps poops very well contained as well as the hay. But buying cardboard boxes every couple weeks depending on if they get soiled can be expensive. Also you have to watch to make sure that he doesn’t ingest to much cardboard if he decides he loves to chew on that as well 