HICKMAN, Neb. -- Several thefts have been reported around the Hickman area this week and Lancaster County Sheriff's deputies need your help in finding the suspect.   Sheriff Terry Wagner says items from unlocked cars and lawns have been taken from subdivision north and west of 68th and Hickman Road sometime between Sunday evening and Monday morning. All items combined cost about $500.  People have reported lost phones, wallets, medications, a GPS, Husker lawn ornaments and small amounts of cash.