Historical Reg Number Help!!

[Bryan Kuo]

Hello Everyone!

This is my first post!

I've been dying to find out the registration numbers of the flights I took 7 years ago across Australia... and I stumbled across the amazing 16right! Only to found my flights were just slightly before its earliest records...

So I came here hoping to get some helps from you guys!!

I hope this is the right place to post this kind of request. If not, please let me know.

Here are the flights: (Time is local, scheduled time)
2005-05-31 / CX 111 / HKG-SYD / Arrival at 06:15 (HKG Departure: 05-30, 19:10)

2005-06-09 / DJ 712 / CBR-MEL / 0915-1020
2005-06-16 / DJ 315 / MEL-BNE / 1030-1230

2005-06-17 / CX 102 / BNE-HKG / Departure at 13:05 (HKG Arrival: same day, 19:55)

I have tried many places but couldn't get any clue...
Hope someone can help me!

Thanks for taking your time reading.
bryan