Nono, standard priority has no tracking. It only has some crappy customs number that the seller and buyer can use to check the acceptance and the delivery date. This method is generally unreliable (from what I've seen) in terms of providing the sender with delivery confirmation; which can then be used in paypal disputes. This is why I think sellers refuse to ship priority.

Yours was sent registered priority and with tracking results like those you just showed us, is certainly A-ok in paypals eyes I'd say.

Here's the tracking info from my own package which arrived a few days ago. It was sent express and basically generates the same step by step tracking info as registered priority.

Detailed Results:

Delivered Abroad, January 27, 2010, 1:42 pm, AUSTRALIA
Attempted Delivery Abroad, January 25, 2010, 1:41 pm, AUSTRALIA
Attempted Delivery Abroad, January 25, 2010, 12:52 pm, AUSTRALIA
Attempted Delivery Abroad, January 25, 2010, 12:44 pm, AUSTRALIA
At Foreign Delivery Unit, January 24, 2010, 4:51 pm, AUSTRALIA
Out of Foreign Customs, January 23, 2010, 1:49 pm, AUSTRALIA
Into Foreign Customs, January 23, 2010, 1:25 pm, AUSTRALIA
Arrived Abroad, January 23, 2010, 1:25 pm, AUSTRALIA
International Dispatch, January 21, 2010, 12:42 pm, ISC SAN FRANCISCO (USPS)
Arrival
Processed through Sort Facility, January 20, 2010, 3:32 pm, OAKLAND, CA 94615
Processed through Sort Facility, January 20, 2010, 1:35 pm, PLEASANTON, CA 94566
Acceptance, January 20, 2010, 11:45 am, PLEASANTON, CA 94566