I was at an estate sale before the "plague" brought things to a halt. There were elements of a prewar New Britain 1/2 drive set scattered across a workbench, so I collected them in a cardboard box. I negotiated a lot price on these items and many others, but the place was so disorganized, I made another pass around the open-framed garage. On a cross-brace way above the bench, I noticed a black metal box with a leather handle. Taking it down, it looked like it would be the box for the NB set, and the sellers threw it in with my lot. It did indeed prove to be the original box for the set!