Thank you Scout, Jacob Haller, Winship, and Mike Yuhas
for the quick replies re:

"QUERY listname WITH CONCEAL FOR *@* command".

Three of us ListOwners at ASU have been checking our
List of subscribers by using the "GET listname (NOLock"
command.  This lets us see "concealed" subscribers.
We had agreed NOT to do this when we started our Lists.
Only recently did we realize our goof.
So, we shall change to simply using the "Review" command
(which repects the "conceal" option), or to employ:

Query listname WITH NOCONCEAL FOR *@*

in the future.
Happy Friday Evening to you all.
Dave J.