Funny, but I have had the same sort of experience.
Have moved several times in Oz, and they could not have known where I lived, but not once have I had anyone knock on my door.
Lived in T'ville, Perth, Darwin, Brisbane and Sydney but have never had the fun of meeting them.
Akways wondered what I would say, and for sure I would be polite as I always loved it when I was invited in for a glass of water or drink. Would surely do that and might even have a beer myself!!!!!
Live/working overseas now (Decided to serve where the need is great..............that means I can make more money over here), so dont expect I will get a knock on the door as its a Muslim country. Was surprised to see one of my guys at work have a WT magazine with him and I asked him about that.
Seems there is a congregation here and they are fairly strong.
Buggas are everywhere.
Would still like a chance to debate some issues if they ever do come to my door in the future. Especially like to get a young 'brother'and have a chat to him. Evils of the flesh and all that good stuff, after I told him he should be in University anyway!!