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When contacted by The Times about the missing entry, a bankruptcy clerk referred the issue to attorneys in the case, who did not respond by deadline Wednesday.

Despite the hundreds of hours spent representing Solyndra in connection with various investigations, K&L Gates’ work is hardly a clear sign that the Justice Department will file charges.

The Justice Department also has been investigating the high-profile collapse of MF Global Holdings Ltd., a brokerage headed by former New Jersey Gov. Jon Corzine, a big Democratic Party fundraiser. So far, nobody has been charged in that investigation, and media reports have suggested that charges are unlikely.

What’s more, R. Todd Neilson, the former FBI agent hired by Solyndra to pore over the company’s financial books, spent months investigating the company’s collapse but ultimately said he couldn’t come up with any evidence of criminal wrongdoing.

Serving as Solyndra’s chief restructuring officer, Mr. Neilson found no wrongdoing by the company. Still, he concluded that investors and lenders, including the U.S. government, knew the company faced big risks, such as falling solar-panel prices and a global recession that cut demand sharply.

Mr. Neilson’s detailed report in March concluded that “no material funds were diverted from their original use.”

But weeks after Mr. Neilson made his findings public, K&L Gates invoices showed the federal probe remained unsettled with investigators busy looking for their own answers.