We don't really know what steps they took to launder the money though, do we? Maybe they were dumb and directly moved the coins from a known hack address to Tra

We don't really know what steps they took to launder the money though, do we? Maybe they were dumb and directly moved the coins from a known hack address to Tradehill. If you're a bit patient and are willing to get your money only a small amount at a time I don't see why you wouldn't be able to launder even a significant amount of bitcoins. Use coin mixers, convert back and forth with other crypto-currencies (including Monero if you want), split and merge the coins, mix that with actual transactions to 3rd party accounts (gambling sites, donations, whatever)... Eventually people will lose track, or at the very least you'll have plausible deniability that the coins changed hands at some point.