It is a great find. I had no idea until your post.
I googled it and found this which is funny as it seems no one knows  . No one is in bold as it is a slight exaggeration...
End locks: aluminum foil and saran wrap box tabs are a great invention. (PHOTO)
From the URL:
Rick Evans, a graphic designer based in Underhill, Vt., wrote in to point out the little impressionable tabs that appear on the ends of boxes of aluminum foil and plastic wrap. My quick informal survey confirms what Rick himself found: that approximately 0 percent of the American population is aware of the existence of these tabs.
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Photobucket has changed their site from free for years to now blocking your photos, shame on them and will have to find new way to post albums I have.
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