TradeHill should probably be in this section too as losses due to fraud were the primary reason they stopped operating.  I think don't think Jered posted final figures on how much user fraud cost TradeHill overall, but I seem to recall him talking about specific amounts in relation to some of the earlier incidents which affected them and the amount being in the tens of thousands of dollars.

Although both TradeHill and MtGox covered the losses so users weren't affected, the Bitcoins which were bought and then sold through fraudulent deposit schemes should probably count as "stolen" or "scammed" as they were never paid for by the users who laundered them.