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You got it! The opening is to hide fake passports inside. Duncan was forging passports and sending them hidden in copies of his book. The passport fits perfectly into the slot in the book, and the binding of the book has been made in the same colour as the passport cover. The tiny objects in the plastic tub are microchips, with a shape that matches the symbol on Duncan’s passport (bottom right of the non-photo page). The list of people include date of birth, sex, and Duncan ticked them off as he received their photos. That’s all the details he needed to make a fake passport. Duncan worked for the Home Office as a technician, so could pull some strings to access passport materials and microchips. Finally, Duncan clearly couldn’t resist titling his book “Who Are You Really?”, in a subtle reference to its hidden contents.