The word I'm hearing from my spouse, the senior Refund Cashier in the Membership Department of our Costco, is:
The biggest reason people haven't received their cards is because the address on file isn't where the people are living. The cards can't be forwarded, so are returned to Citi.
They then stand in line at the Membership Desk and ask for the Costco person to make them a new card, (can't do that - it comes from Citi), or that they CALL CITI FOR THEM and tell them to fix the issue. Uh, no. You need to call them yourself...
The second biggest complaint I'm hearing is about the dozens of whiny people bitching about why they can't use their Amex card at Costco - "just for today. Puhleeease???" It laughable.
And the third biggest complaint: Some are claiming they never heard a word about the changeover. "What do you mean my Amex card isn't any good anymore???" The conversation goes downhill from there.
All I can say is I'm really, really glad I don't work for Costco.
Dave