You really want to confirm they are made under licence mate, and your supplier is authorised to wholesale them.
My guess is, coming from China, you have a shipment and stock pile of fakes. If that is the case then you better consider doing exactly what they say and hope they don't decide to really come after you.
Customs must think they have a pretty solid case to be taking these steps.
It's not so much Customs that are cracking down on those brads, it's the companies demanding more be done to protect their brand!