Post arrived opened!
We've received quite a few Christmas cards already. Some people must be far more organised than we are. No problem with any of them until yesterday morning when one of them had been opened and resealed, quite carefully as it wasn't immediately obvious. That card obviously had something other than just the card inside, it was in fact just a letter about what the family had been up to in the past 12 months. Maybe I'm just overly suspicious but gut feeling is that somewhere along the line somebody had been checking for 'usable' contents. No point reporting it as (a) nothing was missing and (b) it could have happened at any stage in its 400 mile journey to us.