I use to be the main guy who caused those old derelict houses to be boarded up in my City. The City itself never owned but very few of the houses rather just had tax liens on them for routine maintenance ( mowing, removing trash and boarding and securing). Some will eventually be torn down by the local government as they pose a nuisance. Most of them wind up going on the auction block for past liens, and are privately owned. Your County or Parish tax assessor will have records indicating not only the property owner but any other persons that have a pending claim on the property. Right now my City is buying up a large tract of old houses with federal and local matching funds, many are boarded up for an Urban Renewal project. A few will be owned by the local government if they are being torn down as a public nuisance. These are the only ones the local government will have the authority to grant permission to hunt. The problem is that gang bangers and meth cookers tend to break into these boarded up houses and conduct their illegal business. They pose a great danger to an unknowing treasure hunter. Be very careful how you approach them. I suggest you at least carry a cell phone and not to hunt them alone if you must. On the other hand, most of them are older homes and should have some silver coin if nothing else. Monty