The company, which employs me, has an ethics line that can be called from any phone anytime. If that call were traced, and a public phone was used, all they would be able to tell is where the call originated. Not who made the call. Is that an option for you? If so, I would make the call immediately.
The company is liable for what employees do, but the employee will ultimately be held responsible.
Back in my USN days we had a saying.......Not on my watch!