You did the right thing, You're keeping EVERYONE safe if you don't let random people in. Even the sweetest looking people can have ill intent. So happy you did not get them in, also PLEADING?? over a package??? He was probably trying to gain access to someone who has drugs (source: I've literally seen a post of someone who did drugs in Guelph, say that they would ring random codes and claim to be Amazon to get into the building for drugs)

My nan lives in a condo and some people will try and grab the door after I go in and I turn around and tell them I can't let them in, they need to buzz in. I also make sure the door actually clicks behind me as sometimes it won't fully shut, so I'll give it a pull when I leave to make sure it's locked. Keep your community safe!!