Your contact should be able to log into upsjobs.com and see their application, as well as its current status, if it shows On File it'll be there. Pilot referrals add points to an application which can move its status from On File to Active.

At least, that was my experience six years ago.

HR has told me previously a pilot referral sticks with a candidate through multiple years, even though the candidate needs to reapply each year.