[ianhawes]

Thats what my bet is on. LE agencies have contractors that procure bulk quantities of prepaid phones, prepaid credit cards, etc.. for undercover investigations. I suppose its possible they traced the BTC from a funded wallet they knew was government related.

[meowface]

If they had prepaid credit cards, why wouldn't they just buy some Bitcoin from Coinbase with it? That wouldn't be traced back to them (unless another law enforcement agency was investigating... or if the fraudsters compromised Coinbase).