The witness account of Trump’s actions after the subpoena was served in May coupled with the footage could be key to the federal criminal investigation that’s looking into a range of potential crimes, including obstruction, destruction of government records and mishandling of classified information.But the FBI developed evidence that prompted investigators to go back to the witness, who revised their story to say Trump had given instructions to move the boxes, the source said.The Department of Justice has previously alleged that classified documents at the resort were “likely concealed and removed” from a storage room at Mar-a-Lago as part of an effort to “obstruct” the FBI’s investigation into Trump’s potential mishandling of classified materials.After Trump returned 15 boxes of materials to the National Archives in January, the Justice Department subpoenaed Trump in May, seeking documents with classification markings that were still at Mar-a-Lago.Prosecutors said in August that that some documents were likely removed from a storage room before Trump’s lawyers examined the area, while they were trying to comply with the subpoena."