Hey; hows it going?
I don't want to get your hopes up; but I did a search using "numbered Z" as criteria, & I came across a guy that found replicas of those C.E. window stickers on E-bay.
Bad part was the post was a year old.
He had a link to that page; but it was no longer on E-bay.
I did however PM the guy to see if he had any info on the seller.
If he replies and has any info on the seller I'll let you know.