How is this snap-in cover used?

A professional from new york says:
how is the 80-011 used?
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Dave Sr. from SWISCO responded:
The 80-011 snap-in cover was used by Crossly a manufacturer of aluminum patio door and windows. This cover was used to cover up the hole on the back edge of the patio door if you did not use the security slide bolt. Crossly has since gone out of business.
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