(CNN) -- The U.S. Marshals Service has canceled the auction of Jesse Jackson Jr.'s fraud case memorabilia after revelations that at least one of the items may be a fake.
More than a dozen items had been up for auction, handed over by Jackson to be auctioned off, with the proceeds going towards the $750,000 judgment against him after he admitted to misusing campaign funds for private use. Jackson, a former Democratic Representative from Illinois, has been sentenced to 30 months in prison.
Among the fur coats and movie memorabilia was a guitar purportedly signed by Michael Jackson and Eddie Van Halen. Those signatures may be fake, the Marshals Service said in a release, saying that they had received "legitimate concerns about the authenticity of the guitar."
"Out of an abundance of caution, the Marshals Service will conduct a secondary review of all the assets," the statement said.
"Once the review is complete, a decision will be made whether to repost any assets for sale by auction."
--CNN's Bryan Koenig contributed to this report