? on PCGS WTC ground zero recovery coins

I know these are not popular here but I have a few questions:
a) I have noticed that there are two variations: first is gem uncirculated with no grades and has Collectors Universe in the back; second has PCGS and grade with PCGS hologram in the back. What's the difference? Why aren't they all graded?
b) Those that are PCGS graded do not have a coin number, certification number nor bar code. Does this mean that they are not in the PCGS pop reports and databases?
TIA for any info.
a) I have noticed that there are two variations: first is gem uncirculated with no grades and has Collectors Universe in the back; second has PCGS and grade with PCGS hologram in the back. What's the difference? Why aren't they all graded?
b) Those that are PCGS graded do not have a coin number, certification number nor bar code. Does this mean that they are not in the PCGS pop reports and databases?
TIA for any info.
trozau (troy ounce gold)
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