I found an existing script that took the parameters:
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Bookmark list guid
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Number of finds required
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Count hidden
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Name of bookmark list
From this I created the checker http://project-gc.com/Challenges/GC4RMW5/862 . Please verify it as well as you can, I ran it on one of the names who has logged the challenge, and it looked good at first sight.
PS! Adding tags like I did here is something that anyone can do. But it requires some understanding to the system, and I do not say that it is easy for everyone. But technically, anyone can do it.