This one was not bent, but I thought a little more care should be taken with the card.
I think it is normal to keep the card from getting wet and bending since it is being mailed.
I think it would be better to use a hard sleeve or something to prevent bending since there are cards in it.
The card was bent so much that the lines were clearly visible.
I don't blame you for missing the card, but I thought it was a quirky thing to do.