Cela arrive que les lettres s'abiment dans les machines surtout si elles ne sont pas mécanisables et qu'elles contiennent des petits choses !
No, pas de machine ici, malheureusement.
Maybe paranoid customers? Too curious mailpeople? Recently I sent a chaincard to an Eastern European country, a postcard with the address on a paper, sticked with washi tape to the card. There was no room on the card for some nice part of the selvage (stamp edge) so I hid it behind the address paper. After arriving, the receiver told that the paper apparentle had been removed, and moved back /sticked to the card again, and she thought it probably had been customers.Not nice, indeed...
As I told you in a letter, I really don't know. Happily, these happens only from time to time, maybe 4 times since I live here. I hope these were the last!
I have only seen this if a sorting machine damaged a letter. Usually then a kind postal worker places the damaged envelope inside another envelope.
What you describe have happened to me sometimes. Usually, the postal services include a note of apology (useless, but anyway... We can understand that machines aren't perfect). Unluckily, this is not the work of a postal machine, but of a human :(
Thank you for coming. All your comments make me extremely happy.