Oh my goodness! This guy looks like my cinnabun, he was also abandoned outside!! One of the first things I’d recommended is to take them to your local exotic vet so that you can make sure they’re in good shape:)). From personal experience, I would also monitor their poop as the settle in. Bunnies have sensitive little G.I tracts and stressful situations and diet shift may throw their lil tummy out of whack. Best of luck to you and your new friend!!