rescue yes or no?

Hi
My husband is a landscaper, & he came across two baby bunnies in the flower bed of a home. They have dogs, & cats, so didn't seem safe. He didn't see a nest, or a mother, & only the 2 siblings. He just felt they weren't safe. He brought one home, & coworker took the other. Did some internet research, & pretty sure they're a New England breed o cottontails. The eyes r open, & fully furred, bout the size of a small tennis ball.Think bout 6-10 wks old, but will it die without the mama? Gave it cabbage, & water for now, but just seem frozen. Don't wanna over traumatize it, or overstimulate it. Would like to keep him, but wanna do what's best. Does anyone have any suggestions, &/or advice for a first timer. I'm very much an animal lover, & have had many, of various breeds in my life, including gerbils, hamsters, chinchillas, and even a chipmunk. But this will be the first rabbit, & I wanna do the right thing, even if means not keeping him. Thank you!