On the back of each is the prompt for that country. I let him do his writing assignments on the computer or Alphasmart because of his fine motor abilities.
I did purchase a small (little smaller than I wanted) mailbox to put his prompt in each day.
I can then put his little mailbox with prompt inside into his workbox with the flag up of course. Actually he reminded me of the flag. Great attention to detail that boy!
I wanted to share the three sets of postcards I made in case anyone else would like to use them. There are 36 overall so you could pick and choose if you wanted. I printed each page with the front side first and then flipped the paper and printed the backs. I printed all mine on cardstock.