Used stamps exchanges.

This is my first time, so perhaps I am doing something wrong. The ID on the envelope "RU-1568" does not work. Is there a way to see ID's of letters sent to you?

You can only register the id's that are for you. If you guess whats wrong in the code, you could register it.

You can view details about the exchanges that were sent to you after they expire (90 days) in page "Stamps exchanges", section Expired

I scrambled a couple of numbers an cracked the code :)