Boy that is a tough one, I've never done it that way. But If I did I would send it so that someone had to sign for it.
I think a quiet conversation with the commander would be my approach. Maybe better if you have your wife do that in Thai explain your situation and ask for help, in a non challenging way. People always like to help never liked to be told what to do.
To be honest I have never done it for fear of it getting lost in the mail. Will EMS get a singnature of receipt?
Best thing is to call them and do what they tell you, not us.
It's not unusual to get two versions in Nong Khai depends on who you ask and also the person asking the questions, Remember no matter how good they are Englsih is a second language to them. Mistakes can happen






