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@gutterpunkz05 wrote:

From memory, isn't that ebay identifier, supposed to supply additional tracking info to ebay,  Just my recollection as to why it was brought in.

As far as the red post boxes go, I rarely use them and  have had items not show any tracking until delivered.

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That may be the theory,  but Australia Post are the only ones who track the parcels in their system, and they don't read or track the Ebay numbers.   So not sure how Ebay can track them at their end,  maybe magical invisible parcel detections on the Freeway.  LOL   (Laugh Out Loud)