Did he perhaps knock instead of ring? He couldn't know that you are hard of hearing and I get ones with alternating preferences at my door. The delivery system is indeed very *** though recently around here anyway. Knock or ring they only do so once then leave the parcel on the floor, retreating so fast that even when I am sitting about ten feet away from the door they're gone when I get there.
Very unsafe especially when living in an apartment complex, the parcel can easily be stolen. What if the resident was staying with someone else for the night or on vacation.
Another inquiry about your situation, were you in a position to have heard the doorbell? Not say in the shower? I have perfect hearing but can not hear my doorbell from the shower.
The only reason I ask is from experience. I have discovered parcels sitting at my door that due to the timing had to have been delivered either while I was in the shower or still asleep (if I were asleep they obviously knocked as the bell is perfectly hearable from my bedroom even with the bedroom door closed).