Thank you to everyone who responded.
The litterbox is not a possibility seeing as the only time the bunny was out and about, he was under close supervision by me, and tended to just like to sit in my lap anyway during this time. I think it's possible that he could have gotten spooked and that...
Hello,
This morning I found that my new rabbit had passed away. I have only had him for about a month or so. I am new to owning rabbits so I couldn't tell you what kind he was, he was all black with fairly short hair and ears that pointed up (instead of the floppy ones). He was absolutely fine...