Answer 1/What signs is your snake exhibiting that you feel he is hungry? Are you feeding prey the same size as the largest part of your snakes girth? BRB's are known for being voracious feeders so its no surprise. It's unusual for them NOT to have a healthy appettite. If your snake is cruising constantly looking for food before the 5 day mark, then you may need to up the prey size. Also, you never mentioned how old your BRB is??
Answer 2/BRB's are extremely variable in colour. They range from crush orange to cherry red to mahogany to poo brown
Even the brownest BRB can still be as healthy as the next