Hi Marshmellow,
Welcome to binky bunny! You might want to visit our litterbox info section (https://www.binkybunny.com/Default.aspx) to learn more about litterbox habits. novalentine gave you good advice, and i’m glad to hear you removed the cedar chips.
As novalentine recommended – if there’s a spot he seems to be going repeatedly, add (or move) a litterbox there. Adding some hay will also encourage him to use the box, as well as some small treat as a reward.
Is he neutered yet? Many bunnies who aren’t neutered have more difficultly litterbox training. He will like a much happier and healthier life after he’s been neutered.
there are a number of safe litters: carefresh, aspen supreme, yesterdays news, wood stove pellets are all popular safe choices.
while he’s getting adjusted, you’ll want to limit his territory. what he’s doing by peeing and pooping everywhere is marking his territory. i’d recommend confining him – so if he has a whole room to roam currently, limit him to just a part of the room. Add more boxes as needed until he gets the hand of litterboxing. Once he has that area down, you can slowly increse his space as he improves.
keep us updated 