I guess for posterity here are a few things someone could try if they were facing this one -

*The US Census Bureau serves an API for the ACS data if you're working in the US, I'm sure many other countries have something similar. I tend to see more fraudulent accounts in areas with higher population movement and lower income.
*Besides account data I would ask if you could look at geography. Either geolocating accounts or looking at the specific addresses that a given account is at. The biggest predictor I've ever seen that an account will become fraudulent is that there was a fraudulent account at this address previously (I can't track people across accounts, so this common geography is a signal but not a guarantee that it's the same person opening a new account)
*Are these actually credit card accounts, exactly? Is there any chance that some of these might be prepaid cards? Prepaid cards look a lot like credit cards to processers but I see 3-5x more fraudulent activity on prepaids than I see on vanilla credit cards.