I've moved snappers. Hadn't had the opportunity to move a box (although I have spotted them in my yard).
DH one time spotted a big snake in the road. He turned around to go move it off the road, and while we were riding back to it, a big SUV passed us. And in moving out wider to avoid us (the cyclists), the SUV hit the snake! I'll never forget seeing the snake's body bounce up in the air like that. DH was a basket case! He was sooooo upset! I don't think he forgives himself to this day. (Personally, I think the snake was dead before we saw it, but he swears it wasn't.)