Here's a successful example of tracking a Registered letter from Future Park Rangsit to Washington, D.C. Takes a bit longer than regular first class airmail but I like the confirmation of delivery feature. FYI, Registered much cheaper than international EMS.

Mac

http://track.thailandpost.co.th/trackinternet/Default.aspx

Search Result : RR091774294TH

DATETIME Scan Location Description

March 4, 2014 10:37:53 FUTURE PARK RANGSIT Accept

March 4, 2014 20:07:23 FUTURE PARK RANGSIT Items Into Container

March 4, 2014 20:09:33 FUTURE PARK RANGSIT Dispatch

March 5, 2014 08:54:23 SUVARNABHUMI MAIL CENTRE Container Received

March 5, 2014 11:42:51 SUVARNABHUMI MAIL CENTRE Departure From Outward OE

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

www.usps.com

DATE & TIME STATUS OF ITEM LOCATION

March 24, 2014 , 11:08 am Delivered WASHINGTON, DC 20036

March 24, 2014 , 9:08 am Out for Delivery WASHINGTON, DC 20036

March 24, 2014 , 8:58 am Sorting Complete WASHINGTON, DC 20036

March 24, 2014 , 6:35 am Arrival at Unit WASHINGTON, DC 20036

March 23, 2014 Depart USPS Sort Facility WASHINGTON, DC 20066

March 22, 2014 , 5:12 pm Processed through USPS Sort Facility

WASHINGTON, DC 20066

March 21, 2014 , 8:58 am Processed through USPS Sort Facility KEARNY, NJ 07032

Now try it the other way ie coming into Thailand

Every registered package I have received from overseas has been tracked in Thailand with no problems.

Its a great service (registered) and reliable.

It may be reliable, but it seems very slow. It appears to have left Bangkok on 5th March and arrived in

Washington on 24th March. Where was it between times?

Staging areas waiting to be sorted when they get to it given a fixed staffing level, rather than to a fixed timeline.

That's why it's so cheap, I think that's actually pretty fast for the price,

If you're in a hurry, feel free to pay more!

It may be reliable, but it seems very slow. It appears to have left Bangkok on 5th March and arrived in

Washington on 24th March. Where was it between times?

NSA checking it?