Although counterfeit print cartridges may look like genuine HP print cartridges, they don’t provide you with the high print quality, proven reliability, and consistent yields you have come to expect from HP products.
The potential risks of using counterfeit print cartridges include poor quality print-outs, reduced page yields, print cartridges which fail prematurely or do not work at all, printer damage which may require repair, interruption of printing infrastructure and workflow, as well as potential invalidation of hardware warranties. Poor or inconsistent print quality is a primary indicator of non-original products.

Typical material seized in an anti-counterfeit raid by authorities.
...conducted 4,620 investigations in 55 countries resulting in 3,528 enforcement actions conducted by law enforcement officials where more than $795 million USD worth of counterfeit Supplies products were seized
...supported law enforcement authorities which seized more than 8 million counterfeit HP inkjet cartridges and more than six million counterfeit HP LaserJet cartridges – a total of more than 15 million counterfeit pieces worldwide
...has been involved in investigations and actions on every continent except Antarctica

Warehouse containing counterfeit print cartridges in Dubai, United Arab Emirates.