The Pottawatomie County District Attorney’s office in Oklahoma is auctioning off six Ford Mustangs they believe could be counterfeits.

Fox News reports that the vehicles were seized during an investigation into a car cloning operation run by lawyer Kermit Milburn who killed himself in 2016 after being accused of trying to pass off fake Shelby Mustangs with fake VINs as real during an Indianapolis car auction.

The six vehicles in question come from Milburn’s personal collection and have been in storage since his death.

The cars include two 1970 Ford Mustang Boss 302s, a 1970 Shelby GT500 Convertible, an unfinished 1970 Shelby GT500, a 1970 Mustang Convertible, and a 2006 Ford Mustang GT modified with Shelby parts. According to District Attorney Allan Grubb, some of the Mustangs could be authentic but he cannot vouch for their provenance and all have been issued new state titles and VINs.

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Most of the funds raised by the sale of the six Mustangs will benefit the attorney’s office and county jail.

A look at the online auction which runs through until February 8 reveals that there is some interest in the cars, despite their originality being in question. One of the two 1970 Ford Mustang Boss models, for example, had attracted a highest bid of $26,500 at the time of writing. What’s more, the 1970 Shelby GT500 Convertible being auctioned already has a highest bid of $55,000.