Yes bar looks ok - although not particularly interesting. The individual was just awarded the EK2 in WOI and the other three are all post-war commemorative medals. Unless there is a much sought after EK2 on the bar it is a 80-100 usd bar.
IMO the paperwork is not worth much in addition to the medal bar.
It appears to me as the rank writing on one of the papers is Feldwebel or possibly Feldwebelleutnant. If this is correct than I am surprised that there are no other WWI/Long Service medals on this bar (assuming this was his).
Comment