Please notice that if you try to register a postcard with a wrong ID, nothing will happen: feel free to try several combinations, it will only accept the correct one. For instance, it's quite common to confuse 1's with 7's and 8's with 9's.

If everything else fails, you can use the following form in order to request help on finding the correct ID. Please add as much information as you can gather from the received postcard, that will help us identify the sender.