1. This is the full tracking of your parcel:
Parcel No.03266733364 tracking result
2016-06-20 11:06:38.0 Electronic Data Received
2016-06-21 20:21:19.0 China Post Group 浙江省Yiwu city 邮购配送公司 received
2016-06-22 01:04:00.0 China Post Group 浙江省Yiwu city 邮购配送公司 customs scan
2016-06-22 01:22:00.0 leaving China Post Group 浙江省Yiwu city 邮购配送公司

2. Normally those type of parcel China Post Ordinary Small Packet Plus takes between 30 to 60 days before delivery. For your country China Post Airmail Parcel Estimate Arrival Time can be found here:
http://track-chinapost.com/China_Post_Arrival_Time_Stat.php

3. You have pass the estimated arrival time, but don't forget this parcel was sent by the most economical way to overseas so it gets the last priority to get on board an Aircraft to your country Sri Lanka.

4. Please make sure you still have buyer's protection for this parcel and I would wait another 2 weeks. If in 2 weeks you have not receive the parcel then contact seller and tell him the parcel did not arrive.

5. You could also contact seller right now to tell him that you are worry about your parcel because it has not arrive.

Hope this help.