Sometimes it can be hard to train a bun before they are mature and altered – but not always. If you want to try, remove all that bedding from the cage and put bedding JUST in the litter box, then adjust for where he chooses to go. Buns prefer an absorbent area and multiple boxes to start iwth are best if the cage is big enough. Spot clean the areas he uses outside the box with vinegar/water as needed. Also, putting hay in the box / over the box in a hay rack helps. Not sure about 10 weeks, since that is pretty young… but I litter trained my 4 month old before she was physically/sexually mature or spayed (of course, she’s since lost her litter habits due to bonding, argh, but solo she was perfect about it).

I agree with Stickerbunny–remove all the bedding except for what goes in the litterbox.  When he makes a mistake, soak it up  with a paper towel and put the paper towel in the litterbox.  Clean up accidents with vinegar and water solution, or a product like Nature’s Miracle.  It may not be the prettiest looking thing in the world (pee soaked paper towel), but that’s how I trained Simon (he was neutered, and about four months).  the poos you can just pick up with a paper towel and place them in the litterpan, too.  Eventually, he’ll get the message.  It took Simon a couple of days and a few accidents, but he’s been free range for over three weeks now and no mistakes.  Time and patience are your friends.  And like Stickerbunny said, he may not completely train until he’s a little older and neuter–or he’ll train up nicely, and the hormones will hit, and then you’ve got what appears to be an untrained bunny (but really you’ve just got a hormonal bunny whose natural instinct is to mark territory with pee and poop; that’s one reason neutering is so important, it will help with litterbox training). 

Also, limit his free range time.  Cage time isn’t a punishment–it’s a learning experience.  Depending on his set up, you can put two litterboxes in his cage or X pen.  See where he tends to ‘go’ and then put one there.  The more, the merrier, when it comes to litterbox set ups!  You can gradually decrease the amount of litterboxes when he gets the idea. 

Olive pretty much trained herself, but now she leaves stray poops around on the carpet .  She used to be impeccable with her litterbox habits, and this started before Simon came along (I bonded them; Simon’s from a shelter) so I can’t for sure say it’s a territory issue (she’s spayed, he’s neutered).  But, she pees in the right place, so I count my blessings, and pick up the poos like a good human slave .

I agree with everyone else. I did the bedding mistake, and took it all out, and put it only in the litter box, and wham! My bunnies litter habits have been good since she was a tyke.

Moving to behavior section….

Great advice from everyone! It depends on the bunny, but it’s very possible for some to be fully litter trained at that age (my boy was). Like the others said, all of the bedding in his cage makes him think going everywhere is ok, but if you put it in just his litter box, along with some hay, and see if he gets the hang of it.