Happens all the time when someone goes on vacation. Sometimes migrating birds as they certainly enjoy fruit. The ocean carries fruit and seeds all over. People bring seeds or pears home that they enjoyed. They order wild pear seeds and make intentional attempts to grow them. Like I said it could also be genetics reverting back like what I think happened with seckle. Take a close look at my seckle Seckel Pear - #42 by clarkinks
Most things like this I keep to myself because it’s purely speculation and based on nothing at all more than an idea.