Regularly see Silverback's DC-8-62F (9XR-SD) around SHJ, EBB, NBO, and JNB. Believe that 9XR-SC is undergoing C-Check.
Seems Silverback is concentrating on African, and Africa to and from Middle East market, going from sterngth-to-strength. Hear they are also shopping for a DC-8-73F.
9XR-SD was in JNB on Fri evening 6 Oct 2007. Seems they are still flying strong,...best of good luck with their operation!