I just love it when people complain when their mail is wet, when it's been pouring down with rain .
In our case, it had been raining a lot in the UK when it was sent, but not in the US. It was posted at a Post Office. No one handled it on a route until it was delievered by registered mail on a sunny day on the US side. It's possible it landed in a US airport that had rain and sat being drenched, and that is why I am not sure it was a UK thing at all.
This parcel wasn't wet in the way that indicated a brief damp walk in the rain. It was wet in the manner of someone dunking it into a lake. I squeezed water out of some of the papers. If it had become wet in the UK, it had been out of the UK for days at this point. Either someone took it to the beach for a swim, it was set on an open container and allowed to soak up some rain, or it was dropped into a puddle and left there a while during transport
Our life as a couple depended upon this parcel, and the package we sent to the embassy contained visibly damaged documents (like the sponsor's letter which I had to unstick from another document because they had fused together because of
the damp being drenched).
I assume you do a great job because I tend to do that unless I know otherwise. However, I've seen people really balls things up. It doesn't mean you, but it doesn't mean that everyone who complains of damp mail when it's raining is whinging without warrant.
On a side note, why don't they make the bag/cart thing more rain resistant if it's really exposing post to the elements? Or are we talking about complaints about a few drops that something might pick up from the bag to the slot? I can honestly say that I rarely receive wet mail here. The time that the carrier left mail half in the slot was one of them.