When I was considering the purchase of my Bellanca Viking, it was located in Texas, and I was in California. I kinda wanted to see one in person without having to fly to Texas first. So, I did the research and did some cold calls to see if someone would be willing to let me come take a look at their airplane. Made a few calls to people with the same name as the registered owner but who were not, in fact, airplane owners. Oh well. I did talk to one lady who said that yes, she and her ex-husband had owned a Bellanca, but that he preferred to let it rot instead of selling it as part of the settlement. Sad. She did share with me that she had wonderful memories of trips in the plane. One guy was happy to set up a visit to look at his plane. Turns out that he and I are in the same row of hangars now, with just one hangar between us.
In all cases, I jumped right into who I was and why I was calling. Even the wrong number folks were understanding and nice. One even wanted to chat about how to get into flying. It all depends, I guess, on your opening lines when they answer the phone. I would always start out with “I’m sorry to bother you...” That seemed to work wonders.