Do houses €200 - 300K get sold on the QT (not advertised)?

I was speaking to a friend who lives in an area where houses fetch 4 - 500 K and was saying that a few properties sold quietly.

One example was a neighbour who exited to Canada with her house sold and no one knew til she was gone.

A probable reason was the house loan was distressed and she didnt want the neighbours viewing as a final insult to loosing her home. She said she was a private person

Do houses at lower prices like 2 - 300 sell like so? Im presuming yes as some people are very private and dont want the neighbours in for a view and chat particularly if the banks are forcing a sale and they dont want to talk about it.