We're just recently had a rash of attempted fraudulent online orders this week, all shipping to what would appear to be a business in detroit michigan. However it's really what appears to be a residential apartment complex of some sort.
Anyhow, thankfully we use a service that tracks this type of behavior and were flagged in our system as coming from an open proxy and that the address and email they were using were tracked to other fraudulent orders from other merchants.
Be wary this up coming holiday season. Tis the season to be theiving!
I know that we cannot talk about what service I use, but it's really cheap and saved us a fortune over the last few years. You can PM me if you like.