Ours was on a slightly smaller scale, being college-based rather than through the wider university, but we had a manned reception that would accept all post. Each of us had an individual mailbox and key, where smaller post/small parcels would be delivered to collect (the porters all had a master key so even medium-sized packages could be placed in our boxes, even if they didn't fit through the letter slot) and we would be given a parcel slip for anything bigger where we would go and collect from from behind the reception desk.