1. This is the tracking of your parcel:
Number: RJ851883620CN
Package Status: In Transit

Destination Country: Ireland

Origin Country: China
2016-11-09 18:03 Shanghai Pudong, left
2016-11-09 18:03 Shanghai Pudong, left hand navigation
2016-11-08 20:11 Shanghai Pudong, reach
2016-11-05 17:50 Shanghai Qi Yun
2016-10-31 19:10 Shanghai Exchange Bureau, have been exported directly
2016-10-31 18:36 Shanghai Exchange Bureau, have been exported to open
2016-10-29 12:44 Exchange Bureau of Hangzhou, have been exported to each other (internal transit)
2016-10-29 12:11 Exchange Bureau in Hangzhou, has been exported to open
2016-10-28 15:04 Jianshe road, Taizhou branch, left, and next stop "Taizhou City Center"
2016-10-28 10:50 Jianshe road, Taizhou branch,
2016-10-28 10:49 Jianshe road, Taizhou branch has been accepted
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2. Your parcel in On Route/In Transit to your country since the 09 Nov, aircraft departed China going to next airport. Also your parcel tried to depart China on the:
2016-11-05 17:50 Shanghai Qi Yun

3. But I suspect there was no more room for the mail bag with your parcel inside it, so it came back and was able to depart on the 09 Nov.

4. You might want to read this for your country Ireland:
http://track-chinapost.com/China_Post_Arrival_Time_Stat.php

5. Please do take into consideration that this is the busiest period of the year for Postal Service in both countries.

Hope this help.