I did the same but now I'm at the understanding you're unable to track the package that way... I think? This is my first time ordering from china
It said free tracking under the flat rate shipping and it was part of the option, so you should get a tracking number.
Ordering from China is pot luck, you can get your package in 10 days once shipped, but can take up to 6 weeks if really unlucky, that's the price you pay for getting things a lot cheaper.