In this official collection for the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), you will find a number of resources that deals with firearms, guns, and explosives.
One of the popular titles within this collection is: ATF Safety and Security Information for Federal Firearms Licensees: For Theft/Loss Reporting Procedures, See Back Cover: How to Report a Theft or Loss of Firearms.
If you are interested in the Federal laws relating to gun licenses and internet sales, check our newest title, Do I Need A License To Buy and Sell Firearms?: Guidance To help You Understand When a Federal Firearms License Is Required Under Federal Law