It can still be done and I just sent a box to Los Angeles from Bangkok. The restrictions I had to follow:

An unsolicited gift

Value less than  $100

It's really easy. You have to go to this website where there is a form to fill out your Thai address and the destination, plus they have a customs form where you list each item and the value:

https://dpostinter.thailandpost.com/

 

Print it out and take the paper along with the unwrapped items to the local Post Office. I bought a box there. The employees look through the stuff and then will pack the box, add bubble wrap, and then tape the box closed.

The one drawback is the expense. For a 24x40x17 cm box under 2 kg, my cost was 2,600 baht. Way more than the gifts were worth and I probably won't do it again unless sending something really valuable.

Thanks very much for posting this 😉

UPDATE:
The package was held up in Thai customs and returned. Two problems:

1. I included a bottle of body wash in it, and you aren't allowed to send liquids.
2. I included three of those herbal inhalers you see Thai people sniffing. You aren't allowed to send medication.

The post office called me yesterday and I went there today to remove the items. They looked through everything else, sealed the box, and said it should go through this time. No extra charge.

UPDATE 2:
The package was rejected again by Customs. After the previous rejection I had asked the Post Office if I needed a new customs form after removing the items and they said I did not. However, the customs department rejected it and said I have to create a new one.

I now need to go back to the Post Office with the new form, along with my passport.

 

UPDATE 3:

Rejected again. New problems:
1. I was sending packages of tea from Chiang Mai and listed them as "green tea". You are not allowed to send agricultural products.
2. I included two bags of My Chewy Taro candy and listed it on the customs form as "candy". This is too vague because candy can contain alcohol or other prohibited items.

The Thai Post Office employee, who was very nice and apologetic, said if it was labeled as Matcha or Oolong, then it would go through. However, Thai Customs requires the use of their online system which does not provide Matcha or Oolong as an option. The Postal employee said she would try to take care of it and I didn't need to go in again, so I guess she is manually writing Matcha on it.

According to ChatGPT, using "tea powder" might have worked because that wouldn't be considered "leaves" and so not an agricultural product.
But Perplexity.AI disagrees, and says "tea powder" is more regulated and would invite higher scrutiny. It suggests the "tea infusions" because that is how tea bags work and is more precise because it doesn't sound like I'm sending a bunch of leaves.

Perplexity said the online system is a simplified version of customs categories and the Thai Customs people are probably comparing my entries against the entire list of categories and thus rejecting it for vagueness.

They need to fix this. What if I was a tourist and sending things back to the US for convenience?

Did it eventually work? I'm trying to do the same but at the dpostinter.thailandpost site it keeps saying the tracking status is: "in progress" and I don't see anywhere to print out the customs form label. And did you first pay the customs duty? I attached a screen capture. How long did it take to get to the States? Thanks for any input on this

It eventually went through. The tracking completely stopped once it hit Thai customs and I didn't know if it went through, then about two weeks later the people in the US told me they got it, and then tracking updated. It doesn't seem to work with the US systems.

Interesting that it took so long. What about the "in progress" tracking status? Do you remember what came up when it finally allowed you to pay, and download the customs duty print out? I'm not really clear on this part - could you give me more details. I'm not sure I want to use this service from the way you describe it. TIA

I was sending as a gift and it was below the allowed amount and so didn't have to pay any customs duty. Doing it that way, the PDF came up right away for me to print.

For tracking, the print-out had the tracking number and I used the Thai Track and Trace app to follow it.

I think that that's the big difference - I didn't need to pay customs duty, so can't answer anything regarding that.

It's not an easy service right now. It seems like they passed the new policy of digital-only without working out the bugs.

Thanks for your feedback. I don't think the site is working. I keep getting the "in progress" status and the pdf "label", which I've attached. Though I'll have to travel over 100 km, I guess I'll just have to track down he closest FedEx.