I agree with that last, keep looking. Whenever I lose something, it is always because I put it somewhere I would not normally place it and therefore don't think of looking there. Check things like pantries, linen closets, bathroom shelves, anywhere you might inadvertently have laid it down while thinking about something else.
Also, was it in a leather cover and do your parents have pets? If it could be a possibility that a pet dragged it somewhere, check under beds, chairs, sofas, etc...
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