Perhaps it was a shipping company issue, but part of the envelope I received was shredded.
The inner envelope was only slightly bent and the card was not affected.
However, the cards were in a large sleeve with three cards together in the inner envelope, so there was a good chance that they could have been wet, folded, etc. Outbreak.
I think it was just a coincidence that there were no problems this time, so I would recommend that you consider measures to prevent folding and waterproofing.
The card its