Here's an experiment I did a week ago, showing you that box color doesn't always do what it says it will do. Since box color is a universal product it says it will work for everyone, but what it doesn't state is that everyone has different outcomes because everyone's hair is different. I do understand that some clients have gotten the exact same outcome of the lady on the box, but how did your hair feel afterwords? I bet 8 times out of 10 your hair felt like straw or hay, especially after using the blonde.
Just do yourself a favor and stay away from the box color. Come to me and let me do what I am here to do for you.