large lot antique photographic supplies advertising boxes full of old glass plate photo negatives

Large lot of old glass plate photo negatives - there's thirteen boxes full here, as shown. These boxes are from late 1800s and early 1900s vintage photography supplies and originally held glass slides or photo paper.

Interesting old boxes with interesting contents. I haven't gone though all of these slides, there's so many of them. It looks to me like mostly family photos from the early 1900s, 20s, maybe 30s? Not the best camera work in some cases!

Some of the glass is worn, or has chips to the edges or the corners. All of the boxes are worn, dirty or discolored, corners split on most of them.