Again, you don't know where that is intended to go when you are fulfilling the order
Say I own a company, I need to have a proprietary design I need to fix a phone, and I send my order to SK Hynix, only I don't tell SK Hynix it's my company, but I do it via maybe one of those Hong Kong Holding and asking for them to provide the proprietary chip set, SK Hynix may inspect the plant for such a phone (Which I can set up as a front) and then they will fulfill the order if nothing is a miss. They wouldn't know it was for my phone because I won't tell anyone my proprietary design.
The thing is, SK Hynix only will know this is a fake when they eventually see nothing coming out of that HK Production Line front, and by then they probably would have ship them a few batches, and if they are doing it thru multiple sources, they will get enough to start an entire production line.
As I said, I have had experience dealing with this on behalf of a Tech Company, this has happened before, and I doubt it will not happen again.