vPOST Facts

Some things I've discovered about vPOST (this isn't a complaint):

• I ordered 2 packages in 1 shipment, and they arrived on different days. So don't panic if only half your order arrives. DHL has done the same thing, they've made 2 deliveries ON THE SAME DAY.
• When no one was home to accept the package, they automatically diverted it to the nearest PopStation. Not too bad, as long as you have one nearby.
• Each package seems to have a unique ID. Current format is OJA####, where # is a number. They seem to be issuing these sequentially because looking back at my old packages, they were OHP####, OHQ####, OHR####, OHT####, OHZ####. I don't have any use for this piece of information yet, it's just interesting.
• When you ship your packages, each will be assigned another number, VS1234567890 (VS then 10 digits). These also seem to be assigned sequentially, with no check digits. YOU CAN ENTER THIS NUMBER INTO http://www.speedpost.com.sg/ TO GET DETAILED TRACKING INFORMATION. I'm only seeing these numbers on my packages from June 2015. I say the numbers are assigned sequentially because all numbers are used - you can enter a random number below VS0000105000 and see its tracking, unlike say credit card numbers where only a few work. Better yet, get a tracking number someone posted on vPOST's Facebook page and see if their case was resolved. Hmm this seems rather insecure. Someone could run a script to mine all the tracking data, especially since there's no captcha protection. Also, this is an easy way to see how much traffic Speedpost handles and what's their error rate.
• My other package had a different tracking number format, SS######A############ (6, then 12 digits). This didn't work on the Speedpost website, but it worked on http://www.singpost.com/. Hmm I wonder what's the difference between the 2 tracking numbers? Both were parcels.