That's why I almost never buy higher-grade coins. I'm really bad at this sort of responsibility.
And on that theme, there's one funny story...
Last week, I went to grandma's to eat some potatoes, and the only plate left was that huge one with some flowers.
Now, I almost always look at the bottom of any interesting-looking plates (or cups, or saucers) and try to find a stamp of where it was made; I particularly like it when it turns out to be a country that doesn't exist anymore (like USSR, GDR, or Czechoslovakia).
Anyway, when I looked at that particular one, I found some unfamiliar abbreviation that appeared to be the company name... and a Russian eagle, complete with crowns.
The plate clearly was more than 20 years old, so the only realistic explanation was it being pre-1917.
When I showed the stamp to grandma, she said something along the lines of "oh, right, that's a Soviet company, must've been around the 1930s".
I didn't believe her, so I went and googled. Turned out that - even ignoring the question of what the Imperial eagle would be doing on a Soviet-era plate anyway - the relevant company was actually shut down in 1917.
Next day, when I got there again, I explained what I found out, and after taking out a magnifying glass and carefully looking at the eagle, she did agree it probably wasn't Soviet after all.
Which still left the question of, um, what the triangular heck a hundred-year-old plate was doing there with potatoes on it anyway?
...For a few minutes, I wasn't sure why was I so worried about that plate: surely I have coins that are twenty times older?
Then I realized that a plate can be very easily shattered - something I'm sadly familiar with - but you pretty much have to try to really do anything a coin (which is, after all, made of metal).
[That, naturally, only applies to lower-grade coins; anything better than VF can be harmed relatively easily.]
And that, while a bit of a tangent, is actually pretty close to your ideas on responsibility.
Returning back to coins... About two years ago, a certain CCF member sent me a few high-grade 1950s
US coins that he apparently found in circulation back then, including some wheats that looked pretty darn close to mint red (I had to look very carefully to make sure that what I was seeing on the 1955-plain was not any sort of doubling but just sheer glare from the redness).
I've known from previous attempts at getting red foreign coins (eurocents, the occasional shield cent, that sort of thing) that whatever passed for air at my home didn't agree with mint-red coins particularly well, and was really afraid it would also ruin these pristine examples. So I left them in their 2x2s, put the 2x2s back into the package they came in, and hoped for the best.
Well... I take the 2x2s out occasionally to look at the coins, and the red ones seem as red as ever. It's only been two years, though; I applaud the CCF member in question who managed to keep these coins red for sixty.