Yes they vetted the suplier, and from everything I know they haven't had significant problems with them in the many years they have been doing business with them.
However, sometimes good suppliers go bad.
It is their responsibility to make good on what they promised to sell customers, and from all indications they are doing so. They should then go after the supplier to recoup their costs in taking care of their customers.
Now if customers expect unreasonable compensation for the inconveience of not getting what they ordered, that's part of the entitlement mindset. Overnight shipping of the replacement and return shipping costs for the fake is reasonable. Expecting a refund and the replacement or something along those lines isn't reasonable.
Good customer service is good business, but mistakes happen, and passing these chips on from their distributor is a mistake. If companies have to bear a high burden for mistakes and problems that aren't really forseeable, it become cumbersome and unreasonably expensive to do business. Newegg has low prices because they have low profit margins. To keep prices low they have to keep costs down.
A well run company has lower costs in general, but if you have unreasonable expectations, you should expect to pay for them. If you want good prices, accept reasonable solutions to mistakes.