I just did one today where there was a container without a lid, and the log was wet. Based on the logs, this had been the case for quite awhile. I have a kit in the car for such occasions, and had a container that was similar in size and color. So I replaced the plastic bag, dried out the log the best I could, and dropped some swag.
Is it wrong to be a cache angel and take care of someone else's cache? I made pretty much the same case in my log for why I did it. Now it's a better game piece for those that come after me.