Former US President Donald Trump's legal team turned over a folder with classification markings found last month at his Mar-a-Lago resort to federal agents, multiple sources familiar with the matter tell ABC News, the latter reported.

In addition to the folder, one document with classification markings was also turned over to investigators, the sources said.

Additionally, sources said that a laptop belonging to a current aide of the former president was also provided to federal agents.

Sources said the discovery occurred in mid-January as Trump's team was searching through additional boxes amid the Department of Justice's ongoing efforts to have Trump's attorneys verify that Trump no longer still has classified documents in his possession.

The material was discovered in the Mar-a-Lago complex, and not in a storage facility within the complex that housed hundreds of classified documents prior to them being seized in August 2022, the sources said.

During the August search, investigators seized 46 folders with classified banners that were empty.

Trump attorney James Trusty turned over the folder with classification markings to federal investigators, and also informed agents that it had been electronically copied to a laptop of a current Trump aide, the sources said.

The folder with classification markings was discovered in a box with additional papers, the sources said. A copy of the box's contents was made electronically, raising the question about the existence of any additional electronic records that may be relevant to the special counsel's investigation.

The laptop was not retrieved on the Mar-a-Lago grounds, the sources said.

In a statement to ABC News, a spokesperson for Trump called the government's ongoing probe "nothing more than a targeted, politically motivated witch hunt against President Trump, concocted to try and prevent the American people from returning him to the White House."