royals are notorious for being funny feeders. It is normal for all snakes to go off there food but royals tend to be worse than the others.They are a very timid snake.If you are really worried try putting it in a small tub that is not see through and leave alone for a week or so and just very quietly drop a food item in and again leave alone. If not eaten next day take out and leave alone for another week and try again. We have always kept royals in really usefull tubs rather than vivs they seem to be much better feeders. Lots of people make the mstake of giving them vivs that are far to big and this just makes them very insecure.Do you know if it is W/C or farmed or C/B? it does seem to make a lot of differance in there feeding habits.