When you go through, turn every single page of every single document and also turn it over!
Paperclips can inadvertently catch unconnected papers behind them. (One place I worked they were banned for that very reason).
Sometimes a paper with a bit of sticky on it might catch another paper on it.
Sometimes it is just as simple as the paper flipped over and you dont recognize it.
Also, think very very carefully where else it could be - at a parents house, in a bank box somewhere?
(I had this very problem just a couple of weeks ago, turned the place upside down - the document was in a drawer at my mother's home).
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