Nice old German Mills box (later became Quaker Oats)

This German Mills Co. box dates to the period 1886 -1891. The factory pictured on the label burned in 1886 without insurance and the company changed names in 1891 to the American Cereal Co. In 1901 American Cereal reorganized and became the Quaker Oats Co.

I was given the box and have no idea as to its value. Any thoughts would be appreciated.