Postcrossing.com can help find the official Postcrossing ID for your postcard.
First, please consider the following.
1) Make sure that the postcard is an official Postcrossing postcard and not a thank you postcard or a private swap.
2) You can try to enter the correct Postcard ID many times without consequence. So, why not try a different combination? For instance, sometimes
1's can look like 7's, 3's and 5's can look like 8's, etc. Don't worry, the Postcrossing system will not let you register a postcard that does not
belong to you.
3) Postcards with postcard IDs over one year old cannot be registered. Postcrossing.com does not keep track of which member was assigned a specific
Postcrossing ID so submitting an Unknown ID request is not helpful.
If you are still unable to register the postcard, please go to the Unknown ID request page - http://www.postcrossing.com/receive/unknown. Fill in as much information as possible even if you are not sure. Sometimes if there is very
little information, a description of the postcard can help. Note that the postal cancellation mark often displays the date and postal code/city.
You only need to fill out the Unknown ID request once. If you make a mistake, delete the request and enter a new one. It can take several days for a
match to be found. Please be patient.
Additionally, if you find the Postcard ID and register the postcard before you receive a response, please delete the request.
You can delete any request by clicking the delete button for the request on your "Received postcards" list.
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