I used to work in the shipping business and these kind of shipping 'pops' are usually handled something like this:
1. Shipping labels are created and printed at the shipping origin. A tracking number is assigned at the time the label is printed. The label has barcodes containing the tracking number, destination address, and other information.
2. Labels are put on boxes of product.
3. When the boxes are ready to be handed over to UPS, an electronic manifest report is transmitted from the shipper to UPS. This can occur anytime but typically it is sent at the end of each day and includes data for all of the shipments prepared that day (tracking numbers, destinations, etc.). When UPS receives this data they usually post something like 'Billing info received' in the tracking status.
4. Usually when shipments are picked up by the courier the label barcode is scanned as a pickup checkpoint. But in a large batch the boxes may already be palletized so they are not scanned at pickup, but will be scanned later as they transit service centers, sort centers, etc. Many status checkpoint scans can occur as the shipment moves from origin to destination but only a few key updates are shown in the tracking status on the UPS website.
I would be surprised if Google were doing this themselves. I would expect them to contract this whole process out to UPS or let a distributor (or ASUS?) handle it.
Note that at step 1 Google had all of the information needed to send the notification email that I received on Friday night. They could have sent it anytime so it maybe they got to step 3 on Friday, or maybe it's still bogus.
The shipping sequence/priority seems random. Sometimes label batches (step 1) are printed by destination state or zipcode as a presort for UPS, rather than by order date.
I hope they are not sitting around with piles of shipping labels and no product to put them on.
My N7 situation:
Ordered during keynote on June 27, 16Gig, no case.
Received email that it had shipped on Friday July 13 at 9:33 pm. My credit card was also charged on Friday.
Current status:
>>> UPS could not locate the shipment details for your request. Please verify your information and try again later.