His bag very well could have been opened by TSA after he checked it. They should have left a piece of paper indicating as such. While I never had a suitcase opened, any time I checked "oversize luggage" ie. a box (that has been WITHIN the dimensions) it has been opened. Did his duffle fit that criteria. A good way of knowing is did it come out the regular luggage belt or did he have to get it on the side at TLV?