How can I find my postcard

Dear Person who may concern

I send a postcard from Kansai International airport from japan on 25 May , All of my friends are recieve postcard except me.
So I just want to know how I can find my post card. 2 postcard that are missing is
- the drawing of osaka postcard
-the snoopy green postcard

Two of these postcard are send to Chiangmai , Thailand

I bought 70 yen stamp to send it

I hope somebody can help me

Thanrada

Depending on the destination. You may not have waited long enough.

Un registered mail is no trackable. So no way to trace and get it.

Impossible if you did not use the option to track.
Post office cannot track all postcards.

It can be still on the way, it depends on the destination.
Domestic handling etc.

I would give it another few days at least; air mail from the rest of Asia to Japan have taken something like one week up to two weeks.

There is no way to track postcards sent via Japan Post.

Thank you all of your help : )