you can track it in http://track-chinapost.com/startairmail.php ,it it shows as
"Parcel No.*** has not been received by China Post!", then it should be fake number.

Quote from Carlita on March 17, 2014, 09:42
can someone please check this one for me it says the same since the 12th
RB822863574CN

sometimes it needs about 2 to 3 weeks to change status, you need some patient.

Quote from angel on March 19, 2014, 19:54
Hello dear China Post Admin,

can you check this tracking number RB577664075CN ? Please!

RB577664075CN was shipped almost half year ago. if you have not got it , then it should be lost. why don't you take any action for so long time?

Quote from angel on March 19, 2014, 21:51
hello china post
i made the order a week ago and got the tracking number today
should i wait 2-3 days maybe it will update??

Obviously your seller gave you a wrong number. RB577664075CN was shipped in Sep,2013, not March 2014. You should contact seller and ask for correct tracking number.

Hello, I ask you to check this number RB006942149CN.
Seller responds as follows:
Dear,
This is your product shipping message. the logistic company information me, because at present Urumchi is heavy snow, there train is damaging. so the product can't arrive there, because it have't leave China. you can't search it on web. I feel sorry for you very much.
but logistic company tell it can arrived your hand on time. if it over the rules time. I will refund to you $ 5 or give you a microphone as gift.
I hope you can understand. if I have any new message. I will tell you.