A few months back I was talking to a representative of the credential evaluation service
World Education Services (WES). He told me that WES advises their clients to put a very short, WES-generated description of their degrees on their résumé, showing potential employers how each degree compares to a U.S. degree. He suggested that we should help people do the same thing with their TOEIC test scores.
As with credential evaluation of a degree, TOEIC test scores provide objective, external proof of what a person says on their résumé, in this case regarding their English language skills.