The museum filed for bankruptcy last year, and among the documents are lists of artifacts purchased or received by donation by the museum. You can read those lists online at the following links:

http://cdn.blogs.fredericksburg.com/newsdesk/files/2012/07/slaverydoc1.pdf

http://cdn.blogs.fredericksburg.com/newsdesk/files/2012/07/slaverydoc2.pdf

http://cdn.blogs.fredericksburg.com/newsdesk/files/2012/07/slaverydoc3.pdf