Schneider benefits provider data breach

I got a letter from "Employee Benefits Corporation" which is apparently the benefits provider for Schneider. The letter basically says that some people's information that was in their database was found in phishing emails.
It does not directly say whether everyone's information was compromised or not.

It says that the database "may" contain this information:
"Email address, Social Security number, phone number, mailing address, date of birth, and in limited circumstances, financial account information and healthcare related information."

The letter goes on to say that they are providing credit monitoring services, but I probably won't use it since I don't know what I'm agreeing to in order to use it. I can freeze my credit reports on my own

Anybody else get this letter? I have not worked for Schneider in years.