I know where you’re coming from… it’s a difficult decision b/c every bun deserves a chance. But I have to agree, support the shelter! “Littertrained and altered” bunnies are a definite perk, but to reiterate what Jersey said… these buns have been vet-checked, they’ve received treatment if anything was wrong, and been deemed acceptable for adoption. The shelter staff knows the rabbits: their likes, dislikes, and personalities. Some rabbits should not be in homes with dogs, cats, or kids… this is important info if you currently have any of the three in your home. If there are any medical issues, the shelter will tell you what the care will entail. It’s likely that this other bunny has never been seen by a vet, and the owners may know nothing about rabbit health. You could be acquiring a rabbit that is going to need constant medical care for the rest of his life, without even realizing it. If you’ve been in contact with these people, I’d encourage them to surrender him to a shelter so he can have a chance as well.
Definitely let us know what happens! “Dating” buns at a shelter can be great fun!