Both DHL and Fed ex have an agreement with Thai customs. Some duty is always charged so the couriers can add their service charge. What they tend to do is google the product to get a price and then levy up to 30% plus service charge. So if it's for example a Macbook Pro they would google take the upper price if 2599 dollars charge 20% plus service so around $600 or
I have a Bangkok Bank account I haven't used for over 2 years. The wrote to me last month saying if I didn't use it there would be a 50 baht monthly maintenance fee charged.
There are no foreigners allowed into Thailand at the moment. Unless very few like Pilots Diplomatic etc. Next review May 31st but personally I think August with work permits and December with tourist visas.