I include the following boilerplate when I provide clients with filing receipts of their trademark applications:
Your application is a matter of public record. Some companies, often using names including terms such as AGENCY, RIGHTS or CENTER, utilize the public database in order to send solicitations to applicants, These solicitations sometimes resemble official notifications. As your agent of record, our firm receives any official notification that would require a response.
I include this language because my clients are sufficiently worried by the official-looking correspondence that they regularly ask me to confirm their inclination that this is a scam.
The practice of sending ‘government look-alike mail’ is widespread enough that there is a Deceptive Mailing Prevention Act.