Best way to make members aware of someone ripping people off in trading section?

I sold 4 different items yesterday. I have printed shipping labels, sent all four buyers tracking info, And I'm now headed to the post office! Now I realize some people don't have the ability to get things out so quick, I'm retired. but a week in most cases to furnish shipping and tracking info is more than long enough. But then that is my personality, I don't feel right holding someone elses money and their parts. This is why I jump on shipping so quick. I realize other can't do it this quick or it doesn't bother them as much.