I heard back today from the hardware store, and my missing notebook has been found!
*Does happy dance*
I am SO grateful. Upon first glance it seems like just a spiral bound notebook full of kid scribbles (because Lana got into one day), but it contained all my notes for Conclave and some house measurements as well.
Last night I was feeling tired and a tad grumpy, so I went to bed early. Tonight I shall brew coffee and strive to be uber-productive.