Mention that you are pre-approved or a cash buyer to show you are a serious candidate who won't waste their time.
Emphasize that you are reaching out on the off-chance they’ve considered selling, rather than demanding they do so.
If you have ever thought about moving or are curious about what an offer might look like, I would love to chat. There is absolutely no pressure, and I respect your privacy if you aren't interested.
You can reach me directly at [Your Phone Number] or [Your Email Address].
A handwritten envelope is much more likely to be opened than one that looks like junk mail or a bill.