Use a return address when returning deposit to sketchy tenant?

[Jack B.]

I'm sending it via certified mail, and of course not going to put my home address on it. I could use my PO BOX, which seems harmless enough, or the address for the rental which they got kicked out of? 

I think either one is probably fine, since any mail they want to send for legal reasons would have to be delivered via certified mail or FedEx with signature. So it's not like they can send something to the rental or claim they did.

Also, would you include proof of unpaid bills, pictures of garbage left behind, etc.? I want to dissuade these fools from trying to file suit against me, they seem like the type in my interactions with them. Although I have a mountain of evidence such as bills, an email from the utility proving they never established service, pictures, nothing found during pest inspections, etc. and would win a case in court, it's still stress and hassle, not to mention a lot of time lost. Hence why I figured I'd include some of the evidence to dissuade them.