I found more in the crate that held the box of stereo plates than I was expecting. Several other boxes of plates and some lantern slides.
And my favorite found negative ever was in there too!

4x5 glass plate

"Alamo Mine" written on the entrance. 2.7 x 5 inch glass lantern slide

2.7 x 5 inch glass negative

Buffaloes! 2.7 x 5 inch glass negative
There are several hundred of these here, mostly stereo plates as negatives. As I'm looking at these I have memories of one of an ostrich in the big box somewhere, didn't remember the buffaloes.
The stereo negatives and lantern slides came to me when I worked at Stevens Institute of Technology in the mid 80's. They'd been donated to the school and they were in need of making space and were going to throw them out. I asked someone in the library if I could take them home and they said sure. Totally unconserved, they are stacked in chipboard boxes, mostly labeled Ilford or Hammer Dry Plate.