1. Your tracking number is a valid tracking number. Sometimes it can take up to 10 days for a parcel to get register into the China Post system.

2. If you have that tracking number for more then 10 days, then you need to contact seller and ask him what is going on with your parcel. Or the worst case scenario, open a dispute.

3. This is what I get when I track your parcel:
Number: LX250483434CN
Package Status: Not Found
Destination Country: Unknown
Origin Country: China
Item is not found at this moment, If necessary, please verify with the package sender and check back later.
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Thanks