In the civilian world we get alerts to them etc... Many years ago I remember there were some I think Bell 47 rotors that came on the market but were luckily spotted, they were off some other model and had a couple of foot of extra blade simply glued on the end!!!
Similar Note, remember the burnt out BA 747 at Kuwait International, that was all supposed to have been scrapped, indeed BA went to lengths to ensure it was... They got a call from some innocent US company who were looking at buying some fan blades that were been sold as ex BA and they were after details.... Lo and behold they were off the burnt out and supposedly scrapped 747.
Sadly it happens, the USAF has apparently found some of their spares are fakes from China.
US Air Force using counterfeit Chinese parts — RT
http://defensetech.org/2012/05/22/fa...re-everywhere/