I think it's perfectly fine for interested citizens and journalists to investigate those cases, too. There is quite a bit of investigative journalism like that that happens at the local level, at least in some places. For example, if a previously unknown company suddenly starts buying up a lot of local land, it's natural that residents would want to look into what this company is and where their money comes from. Is it a front for another company? Who are its investors? Does it have ties to politicians?