By Jill Reilly PUBLISHED: 05:30 EST, 16 October 2013 | UPDATED: 06:07 EST, 16 October 2013 Legacy: Richard Greener was Harvard University's first African-American A house clearance worker who discovered the papers of Harvard’s first African-American graduate is threatening to burn them unless the university or a collector buys them from him for the 'right price'. Rufus McDonald, 52, found the papers belonging to Richard T. Greener while clearing out a house in Englewood, Chicago, earlier this year. His discovery was hailed as remarkable, as it was feared the records had been destroyed by racist groups or lost in the 1906 San Francisco earthquake.
@highlight
Rufus McDonald, 52, found the papers when clearing an Englewood home
@highlight
He sold two of the documents for $52,000 to University of South Carolina
@highlight
But he claims Harvard are only offering him an 'insulting' $7,500
Mr Greener occasionally lectured until he died of old age in @placeholder on May 2, 1922.