We all know that one can defend non-registered trademarks, I already acknowledged that three days ago.
So why are you stuck on this subject then?
But to be defendable, it has to be in active use - that's why I pointed you to the Wikipedia article, which says "five years". I'm all interested in more precise documentation, but your above link is useless in this context.
Why would I trust Wiki for a legal opinion?
If you don't care, why do you make claims about AInc/CUSA being able to defend it? To determine if they are able to defend it, you need to know the mark's last use in commerce.
So, once again: If it's not registered and you don't know when it was last used commercially, on what grounds do you claim that anybody owns enforcable rights regarding this mark?
Then do as you wish, I don't have a pony in that race. That would be up to C=USA and it's legal department to deal with and I'm pretty confident C=USA won't give an inch with out a court battle. You want to risk that, fine by me, Wal-Mart has tons of popcorn on the shelves.