TNT post says sorry

I received a beautiful, somewhat weathered postcard from Chili. It was packed in a transparent plastic cover together with the following note:

It regrets us to tell you that this item that is mailed to you has been damaged.
In case the damage has been inflicted during the handeling of the mail we offer our appologies.

TNT Post

Although the text was still readable, it was clear that the Chilean mountains that were on the card had encountered some water during its trip.

[ Reinout and Soraya, thanks for the card, how was your holiday..? ]

I love getting messages like this...

I have become very curious what went wrong with the card. Did it blow out of a mailman's hand during a storm, or are the TNT vans not waterproof..?