Before I retired from the Des Moines Police Department I was in charge of the Fraud section. I worked with some of the best fraud detectives and we had great cooperation with the Postal Inspectors, Secrect Service, FBI and others. I can tell you from experience that you need to protect yourself. The goverment won't or can't.
It takes a lot of man hours to find a crook and get solid evidence in order to prosecute these people. If it's not a high priority crime, then not many hours are expended. If the crime is only a few thousand dollars loss then a report is made and not much more. Most solved crimes are actually solved by the victim that gathers the evidence needed for prosecution.
Most crimes are plea bargained to misdeamenors. The big frauds take years to solve and several years to prosecute. Civil cases usually take two or more years to get resolved.
My advise is to protect yourself and your family and don't expect the goverment to do anything for you. Usually goverment just gets in the way and hinders you from protecting yourself, like making it hard to get a gun. Not locking up child molesters and keeping track of them. Keeping criminal records confidental so you never know the evil that is in your mist.