I have receive several letters from these guys named Josh & Lacey (at least that is what their letter states) that they want to by my house for cash.
It is suspicious because:
1. The letter is made out to look like it is hand written and it is not.
2. It uses a mass marketing mail stamp and not a first class.
3. When calling their number you only receive a nondescript voice mail asking to leave your information.
4. Uses a box rental. (in itself is not suspicious).
5. It did not send it to the house that they want to purchase but my other residence.