navcrui

They update your status recognition as you progress higher in Crown and Anchor.  Mine was not frozen at the level I happened to be when I first cruised with Celebrity.   You can see your match when you log in to your account.  Your Celebrity account uses the same credentials as your Royal Caribbean account.
You may find you already have been assigned a Captain’s Circle number.  When logged into your Royal account go to profile and “My Loyalty” to see if you already have a Celebrity Captain's Circle number.
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Cancelled a cruise under CWC just prior to January 7th. Still have no FCC.  Travel agent did another inquiry and it “might be March 17 when I get them.

I don't know if Costco will deal with FCC - you should check prior to doing anything.  Plus, it can take a little while to get an FCC back, and the "deal" may not still be valid.  Costco also doesn't participate in RoyalUp, from what I understand (if that's something you're interested in).

Names are NOT set in stone.  

The first one is a NAAT test which is accepted. You will be required to show the part that shows what lab the test is from.
The second one may or may not be accepted as there has to be minimal handwritten information on the form and doesn't have the address of the testing location.
https://www.royalcaribbean.com/faq/questions/if-need-an-rt-pcr-test-before-i-cruise-where-should-i-go

The second one will not. 
 
 

Is this a casino comp ?  If so, the person who "owns" the comp must sail....so if you have a casino comp and do not show up for whatever reason, the other person will not be able to sail using the comp.  They would be repriced at the prevailing rate.  What I am not sure about is what happens to the comp itself.  If it is an annual prime (or higher) comp not sure if you would get the comp back or if it would just go bye-bye.  If it is an earned comp certificate I suspect it is just forfeit.