One member of the silent jury here replying to your guitar pick question.
It appears that this pick is pretty much as you suspected, new like the Country Boy guitar model:
I don't know about its usage for the Country Boy model, but this is a Signature Clayton White Tour Guitar Pick handed out by Glen Campbell on his Goodbye Tour.Strictly a "souvenir" of your purchase and to me, about as authentic as any deliberately "relic'd" guitar (ie- not very).
It shows up on on the secondary seller's market quite often, but the picks look different. Either some are not authentic or there may have been different runs of the picks. Two examples:
Below is a photo of an authentic one that a crew member for one of the tour stops received (along with his VIP pass). He had posted on social media this picture along with photos of himself and Glen so it is the real deal:
On the secondary market these picks are selling for outrageous prices, imho. But, I don't collect picks, and therefore don't have any idea of its value.
Thanks for a great question!