From THIS LOCAL NEWS ARTICLE:
Police last week seized a number of firearms during consent searches of homes in the area, but need the bullet to match against them. Police also served a search warrant at the property they believe the shot originated from.
At least one resident reported in THIS ARTICLE that he gave consent to police to search his house, but did not consent to them removing any property.
If you consent to a search and they find anything illegal, it's theirs. If they find anything they might suspect was part of a crime, they can keep and examine it. Refusing to consent to a search is always in your best interests. In this case there was no probable cause to search any house whose owner refused.
Mr. Wesner should have filed theft charges, because he wasn't issued a reciept and was not told they were being taken.