He didn't take any thing with him on his forced removal from his self imposed retreat at the embassy, which means any proof of wrong doing by the Clintons or the Trump administration would have to already be in the hands of his trusted followers of which there are many and if he had anything in his apartment/office it is already in the hands of the investigators now.
Now CNN will have more click bait to tickle us with on what secrets Assange has without being able to prove it of course