During my last visit to Laos in February-March of this year I made sure to visit the Lao Post Office at Watty International Airport after going through Immigration and Custom check. It was a small office but the workers there were so kind and helpful. The two workers on duty (a young man and an older lady) told me to take my franked envelopes with me rather than sending them to the Netherlands so that I can keep them in fresh conditions. They knew right away that I was a collector and were more than happy to accommodate my needs.
I later made a visit to Wattay International Post Office in March to have more postcards and envelopes franked. It was another joyful visit for me and I went away very happy with the service. Of course the two ladies that were working there knew my relatives so perhaps they were extra helpful to me.