Ok, some silly question: What kind of value is your #lastopened? Is it of type date? Then your rule is wrong! is set expects a yes/no, but if its a date in this field, your rule has to fail! I tested this here.
When its date you should change to whatever has to do with date/time-settings. The only one which works is "not set". It applies when no date is set.
My faulty first answer, i should have looked better to your pic...
Sorry!
Hope that helps
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