Only 17 states require you to report a lost or stolen gun.
California
Colorado
Connecticut
Delaware
Hawaii
Illinois
Maryland
Massachussets
Michigan
New Jersey
New York
Ohio
Oregon
Rhode Island
South Carolina
Virginia
Washington
I know, but failing to report a stolen gun in any state only to have it used later in a crime will automatically make your life miserable.
Though Texas is not one of these, I've had two guns stolen over the years, and I got both of them back.