Slop Jar belonged to George W. Clayton
See accession files H.3658-H.3741 (2 files in Registration files)
The following is from the biographical note for HC collection Mss.00121:
George Washington "Wash" Clayton (February 22, 1833-August 15, 1899) grew up in Philadelphia, Pennsylvania. Moving to the West to find fame and fortune, Wash built a mercantile store in Kansas Territory and Denver, Colorado, providing miners with supplies. Establishing himself as a prominent business man, Wash became involved in politics related to banking institutions, orphanages, railroads and utilities, and social clubs. Wash left his legacy in Colorado by leaving his estate to the founding of the Clayton College for Boys (1911), focusing their programs on white orphaned boys from prominent Colorado families. In 1967, the school reevaluated their student body and opened their school to all orphans. There are approximately 2,200 pages of correspondence, legal records, photographs and other materials relating to the life of George Washington Clayton and some of his family members.
See also MSS.00121 files in the Archives department.