You're definitely on track. I'm not totally sure about which decade that Vitro header is from either. I would also have late 50's or somewhere in the 60's as my guess but maybe I could/should do a little more digging and I could pin it down. I very much like the Aqua Jewels bag.
You're right about the Army, Navy, Air Force Alox bags being wrong! And about the "RIO Theatre" bag having modern Asian cat's eyes in it.
However, yes, Alox did have poly bags.
(Bigger versions of the next two here: http://marbleconnection.com/topic/6691-mostly-pix-alox-agates)