That is how many copies were actually shipped in the US. It isn't an indication of what he actually sold. He got the certification based on the shipment. He would've had to sell like 500K every week to rack up 2 million in sales.
Breh, 4x - July 10, 1998. RIAA said this is what he have on file. According to what YOU said and what YOU learned about RIAA, that P shipped 4x on July 10, 1998
I asked you, how many were shipped on his release day June 2nd?