What Information Are Stun Guns Recording?

In a story about a stolen Stradivarius violin, there's this:

Information from a stun gun company, an anonymous tip and hours of surveillance paved the way for authorities to find a stolen 300-year-old Stradivarius violin in the attic of a Milwaukee home, police said Thursday.

[...]

Taser International, the maker of the stun gun used in the attack, "provided invaluable information" that the FBI tracked down in Texas and ultimately led police to Universal Allah, a Milwaukee resident, Police Chief Edward Flynn said Thursday.

The criminals stunned a musician as he was leaving a show at church, and drove off with his multimillion-dollar violin. What information could the stun gun company give the police that would be invaluable? Is it as simple as knowing who purchased the weapon, which was dropped at the scene? Or something weirder?