Bingo, used to house scientific instruments for high school use. My teaching career started in 1983 in a high school built in 1933. It is a National Historic Landmark here. We had many of those boxes that held old brass microscopes from the 20's-30's. We were ordered to throw them(boxes) out. We did, although a few of the custodians took some home for tools, carpenter tools and general use. The boxes had those old microscopes with just the mirror to reflect light. Anyway, we(science teachers) tossed the boxes, the microscopes and the rest of the contents in the boxes(lens, parts, etc). I was new and followed orders. It would not be the only things that ever got tossed. Ah, your educational system at work. Oh yeah, boxes were from the 40's. Microscopes just fit. Originally may have contained anything or nothing. Never knew...