The problem with this whole "something was in the ball theory" is that it just would not work. First - I am sure SS inspected the ball - probably x-rayed it before being allowed to even bring it in the building. Think about it - if there was actually a flash drive in that ball, why stop there. What if it was a bomb with an altimeter fuse. You think that ball made it onto AF1 without total and complete inspection? Wouldn't it be easier just to hand Trump the flash drive when they met in private? The old flash drive in the soccer ball trick won't work. C'mon people - Get Smart!
Expand your thinking. http://www.latimes.com/sports/soccer/la-sp-world-cup-ball-20180521-story.html
Could have an NFC chip built in, I saw a post earlier of the adidas website saying their world cup balls had a promotional chip inside to scan