Anyway, a quick search through the aforementioned locations failed to turn up the square baking pan. My kitchen space-wise is average, storagewise is it tiny. There are really only 5 places a baking pan could be and one of those is the dishwasher. The other 4 I have already mentioned. It wasn't in any of them. It also was not in the cupboard with the glasses or the one with cereal, soup and other frequently used dry goods, nor was it hiding under the numerous mostly empty bag of stale tortilla chips. It was not in the refridgerator with something already in it. This meant it must not be in the house, though I had no recollection of taking it anywhere. The last time I used it, I think I baked tilapa in it. Not something you normally take to a pot luck.
We gave up & DH decided to make brownies in a round cake pan rather than make really really skinny ones in the 13x9 pan. He goes to rinse out the round pan in the sink and there, under the pile or small plastic bowls that accumulates in after a day with toddlers, was the square glass 8x8 pan. He washes it out, picks up the box of brownies and reads "Do not bake in square glass 8x8 pan."