Here is a link to a power point about the U/L listing standard for cable ties. I imagine we should be looking for a listing mark if we really want to follow the letter of the law.
http://www.nema.org/prod/be/cable-ties/upload/New%20UL%2062275.pptThis is the NEMA article
http://www.nema.org/prod/be/cable-ties/I am not sure you know whether the ties you see come from the "golden bag" the guy has been carrying in his truck for a year.
