My experience is the same as jonbkk's. I have had boxes get here from the West Coast and Midwest in five days and some take up to a month. I have had
three packages go missing from family members, but out of the hundreds I have probably received this is still a small percentage of lost mail, but some does get lost. Make sure the custom's form does not say anything about e-cigs (electronics or personal items is good to put) and value under $30.00 (anything over 1,000 baht is subject to 30% duty plus 7% vat and a postal collection fee of 20 baht). EMS and Priority Mail get opened and inspected more often than First Class, but if the package is not suspicious looking an inspection is still rare. Out of the many packages I have received,
three have been opened by customs for inspection and two were considered undervalued and I was required to pay duty and vat based on custom's valuation of the items (which was actually quite spot on). If customs opens a package they mark it as opened so you know they inspected it. Once I had vitamins sent here and including charging me duties and vat they included a letter in Thai in the box telling me that vitamins are considered "drugs" under Thai law and require an import permit and next time they might not let them
through if no import permit is included. They were kind and let me have all my vitamins after paying 1,2XX baht in duties, vat and fees.
. BTW it shipped using First-class mail international.
