If you play at sportibg bet sites, and have ever requested a payout by check, if that check arrived by DHL (this would apply to players who play at sports.com and aces.com among others) you might be getting a call from the US postal serivce. Not sure of the nature of the investigation, but one of the 3rd party processors that Sportingbet contracted with is under investigation.
As a side not, the US postal service also knows the exact amount of each check that was sent by this proccessor.
As a side not, the US postal service also knows the exact amount of each check that was sent by this proccessor.