HAMILTON, MI (WKZO) --  Michigan State Police are looking for the thieves who stole 160-feet of copper water pipes and two boxes of shut off valves that were being kept in a storage trailer at Hamilton Middle School some time either late Monday night or early Tuesday morning.   The plumbing was to be installed as part of the remodeling of the school building in Allegan County.  The thieves either have a project of their own, a buyer for building materials, or more likely will attempt to sell it to a scrap dealer.    State Police have no suspects at this time.