I replied to the email asking why some stores don't have the sign.
How come some of your stores in other states do not have these signs?
My local Phoenix, Arizona stores have these signs.
I also read online that one of your Colorado locations had the sign
(About half way down).
I am also told that some Costco's outside of Arizona have
no such sign.
Here is their reply:
The only information we have available regarding our firearms policy is
the information provided by Camille. If you have more direct questions,
please contact our corporate offices at 1-425-313-8100.