CHICAGO (CBS) — The auction of Jesse Jackson Jr.’s forfeited assets was canceled on Friday by the U.S. Marshals Service after concerns about the authenticity of at least one item up for bid.

“After receiving legitimate concerns about the authenticity of the guitar purportedly signed by Michael Jackson and Eddie Van Halen and out of an abundance of caution, the Marshals Service will conduct a secondary review of all the assets,” the service said in a statement.

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“Once the review is complete, a decision will be made whether to repost any assets for sale by auction.”

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Jackson pleaded guilty in February and admitted that he defrauded his re-election campaigns of about $750,000 in funds that were used to pay for personal items and expenses.

Items for sale included memorabilia autographed by Michael Jackson, Eddie Van Halen and Bruce Lee and fur coats and capes.

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Net proceeds from the sale of the auctioned assets were to be used to help satisfy the $750,000 money judgment imposed by the court as part of Jackson’s 30-month prison sentence.