Same here. I ordered two separate packages from Amazon that were marked as delivered but never actually arrived. I was easily able to get ahold of USPS support, and the customer support representative was very professional. I got both of my packages less than a week later, even though I (mistakenly) reported only one of them.

I feel like this depends a lot on the location.

My mail got delivered wet a few times, so I complained. And all they said to me is, it got wet because it was raining. They basically said that there is nothing they can do when it is raining...

A note about when it's raining.

Don't put out any outgoing mail. Even if yours is dry it will get wet when it comes in contact with other mail that is wet.

If you can hold off sending a letter in the rain do so

As an Irishman, this concept confuses me.

Outgoing mail can be placed in the mail recepticle where you receive incoming mail. Often the letters get wet. The carrier takes the outgoing letters.

If it's raining the wet letters get tossed into a bucket, then into a larger hamper than into a machine for sorting.

Wet letters make other dry letters wet. So even if you take them to the post office they may encounter wet letters in their way.

Ink runs.

I think the implication was that in Ireland, it's never not raining.

Lol. Man am I stupid.

Although I have had Canadians tell me that their postman does not pick up outgoing mail. Thats what I thought. DUH!2

I had identical experiences.