Have your HR person draft a cover letter to the Campus Placement office with an Enclosure (Notice of Job Opportunity). They should keep a copy of this letter sent to the University Career Center including a copy of the job notice enclosure in your PERM file.
To be extra cautious and safe, your HR must request a confirmation letter from the university stating that the job notice was made available to the students and alumni of the university from <start date> to <end date>. To make it easy for the Career Center Advisor, your HR can draft a confirmation letter and fax it to them (after the notice expiry date) requesting the career center advisor to photocopy the drafted letter on their University's letterhead, sign and fax back or mail back the confirmation letter to your HR. It is best to put this confirmation letter from the University in your PERM file.
Also, note that the "Notice of Job Opportunity" must be on your company's letterhead and should exactly match everything (job title, location, description, skills requirement, minimum job requesments, notice posting date and notice expiry date) as stated on the ETA 9089 PERM application form.