If you don’t know already, 7-Eleven are running a popular promotional campaign at the moment for people to collect stamps. You can exchange these for various gifts in their store. Thai kids are going crazy over this, collecting all the different stamps in the series. Although you can exchange these stamps for various items, you cannot use them at the post office. Recently there has been a picture circulating on social media of an envelope with 7-Eleven stamps on it. It looks like they have even been cancelled with an official post office stamp. If this picture is genuine, then it means someone successfully used these fake stamps to send a letter. Thailand Post has released a statement now telling people NOT to use the 7-Eleven stamps to send letters. 7-Eleven has also come out with an apology for misleading people about the use of these special stamps.