A bit of digging turned up Monster Cable’s Counterfeit Site.
Here's one of the cables for sale by PGX on Trade Me (who seems to be making a business of this):
And here's a sample of the fake goods from Monster:
Looks identical (except the recycling logo). A look at Monster’s black list of sites caught selling counterfeit cable reveals Trade Me in the listing.
I reported this to Trade Me who replied that ‘appropriate action’ has been taken, though the listing remains along with 15 others.
Update: after more prodding Trade Me has removed all 15 listings from heng12, pgx, and smithjim.