Lionel should just proactively send out an equal number of screw sets to everyone and each dealer that ordered either the controller or extra sensor sleds. Save us all a lot of phone calls. I see no screws in any of the sets I have opened.
Also it seems that Lionel did take the suggestion to trim the corners of the sled so it can be used with curved sections of track. Seems to fit my atlas track fine with curves down to O-54. I will report on operation on curved sections when I have a chance to install some of them.