I read that a little differently.
On June 20 it was given to USPS in Houlton
On June 21 it travelled to the larger city of Nashua
On June 22 it went to Cincinnati and on to Erlanger.
On June 23 it was being processed along with thousands of other parcels
On June 24 it cleared Canadian customs in the Erlanger plant.
Today is Saturday June 27.
By now, your purchase is probably on a truck headed for Canada.
There is no tracking because it hasn't arrived in Canada.
The internal tracking numbers used by Pitney Bowes for their own purposes are not uploaded to the web very fast.
In any case, tracking is an expensive service that is useful for the seller, but does nothing for the buyer who pays for it.
The real purpose of tracking is that it is the main defense against false claims of non-delivery. In fact, one of the reasons for the GSP was to protect US sellers against such false claims from international buyers*.
If your purchase is not delivered on Monday or Tuesday, it will probably be in your hands on Friday. (Canada Post won't be delivering on Canada Day. )
*Not that there necessarily were more or that they were more difficult, but a substantial proportion of the US population is paranoid and xenophobic.
