(Hillsboro, OR)  --  The Washington County Sheriff's Office is warning residents about a scam involving an ad to help a company ship its packages for cash.  Police say the scammers are sending the victims items that were purchased with stolen credit cards.  They're usually small electronics or items that can be sold quickly.  The fraudulent companies appear legitimate and have real looking websites.  If you take one of these jobs, even if you don't know they're stolen items, you can be charged with a crime for shipping stolen merchandise.  The Washington County Sheriff's Office wants to hear from anyone who has fallen for the scam.