What happens to turned-in guns

I have tried in the past to figure out what happens to turned in, and court seized weapons in Illinois.  The only information I could find is that there is no proof of destruction, and no paperwork on their transfers.   Which is why this ex Clarendon Hills Illinois police officer would have gotten away with walking off with a handful of handguns that were turned-in... would have... if not for that "anonymous tip" that informed other officials of this one's misdeeds.   When a handgun is court seized it is defined as being seized for "destruction, or police purposes".    Maybe this is what they meant by police purposes?

Daniel M. Ryan, 48, is accused of stealing five guns in total, including an Ithaca M1911 A1 World War II U.S. Army .45 caliber gun, a Smith and Wesson .38 caliber Airtight Special, and a Connecticut Valley Bobcat .50 caliber gun, said DuPage County State's Attorney Robert B. Berlin....

...Authorities were led to the Westmont man after an anonymous tip in February sparked an investigation into the missing guns, police said. Ryan resigned from the department on April 22, 2011.

While I can hardly believe an Ithaca 1911 was turned in at a gun turn-in event, I find it more astonishing that an  anonymous tip was the reason the police looked for them.