What kind of language is most acceptable for placeholder text?

I have a form that displays the user's current address and allows them to change it. I have a preferred format that I want so I want to provide hints to them as to what is acceptable and what goes into each box.

From our testing, people tend to think we have their address wrong because they believe the hint is what they have on file rather than it being an empty box. I thought about doing this...

But for some reason people now think they have to type in "example:" and the preferred formatting (when it comes to other boxes) becomes a little more unclear.

What is the best way to give a hint to users for what is acceptable data?