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I got a Stant locking Diesel Fuel cap that works great. When I ordered that cap I talked to the Stant technical support person at their factory and also asked him about a locking DEF cap and he said they don't yet have one developed for the 2017 Super Duty. He told me that he has received many requests for one and does not have any idea when they will have one ready for distribution.
Why do we still have fuel caps? They did away with them on the F-150's years ago.
Because the Super Duty trucks are built to
take the regular diesel nozzle at a standard diesel pump as well as the high flow nozzles at truck stop pumps. The gas vehicles only have to worry about one size.