I mailed off my SS letter last month.
Show my Thailand DL, paid about 300 something for EMS and off it went.
Arrived safely in the US. I think it was about 2 weeks.
In the past 14 years, Thailand Post has been flawless.
No Thai National Park is worth even the Thai price.
Go to Malaysia and hike in the Forests/Jungles. Lots of trails, lots of animals to see AND happy people that smile and say hello as you pass on the trial.