One of the reasons that antigun forces give for demonizing gun owners is the statement that all guns start out as legally owned firearms until irresponsible gun owners or unscrupulous dealers sell them to criminals.
In October of 2018, sixteen pallets of Ruger handguns were stolen from a UPS shipping facility. Hundreds of handguns were stolen in what the ATF described as one of the largest single gun thefts the agency has investigated. Two guys pulled a UHaul up to a UPS facility, loaded it up with hundreds of handguns and drove away.
Their only mistake was in trying to sell them out of the back of the truck in a store parking lot on a Sunday afternoon. With rocket science like this going on, they must have had inside information or help.