KJay, as I understand it, the supplied hardware does meet the code requirements for the 'screw locking means.'
Murphys' law being what it is, I next expect the folks who brought this on - remember all those rants against metal boxes on the ends of extension cords, with pictures of the assemblies missing screws and coming apart? - to start ranting anew when they find some place where "Loctite" was applied to the hardware.
Make no mistake about it; there are those who will find fault with everything. These are the folks who won't be happy until EVERY device has a pigtail and EVERY circuit has a gree wire.
No, there is no speciific marking on the packaging regarding the use of pigtails.
Which, of course, brings up another 'detail.' Virtually every cover of this type is made by one of two firms. The code change only impacts the one company's product; 'corners in' or 'corners out' was simply a style difference between the two firms.
