I keep a lot of my memory on a wiki because I am so forgetful. This page might help you.
http://wildsong.biz/index.php?title=Mapping_Vietnam A couple months ago I was working with decollaring GeoPDF files from scanned maps of Vietnam. They are set up the same way as you describe, with one set of corner points indicates the edge of the paper map with collar attached and a second set is a polygon around the actual map area. I think the write up is good enough not to copy it here. Please look at it and let me know. Brian
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