Some of those the seller are obvious fakes or questionable.
Especially this:
http://cgi.ebay.com/China-1947-Cent...VG_W0QQitemZ260287571285QQihZ016QQcategoryZ3432QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I am not sure about other international notes, but I mostly collect Chinese notes. Not sure if anybody noticed this..