I just learned from Bitsyncom that tracking numbers aren't generated until they leave mainland China [i.e. Customs]. Then it is handed off to DHL which then generates the tracking number.
I experienced this several times before with packages (fpga's) from NGZ.
Package untraceable until arrival at DHL office in Europe.
I've had 2 from them (Icarus, DevKit), 1 from Hong Kong (a BFL) and 1 from USA (an MMQ) - all EMS, all 4 tracked fine.
Unfortunately EMS doesn't deliver in my country from China.