I apologise that my life does not evolve around stern letter writing,
I took Maths Physics and Chemistry, I’m not a hairyfairy englishy person -_-
Generally, when a forum member takes time out of their working day to rewrite a letter on your behalf, the lack of a “thank you” and the subsequent insult may well be construed as you being extremely rude.
In the meantime, it does not look like contamination under the seals. As others have said, you’d expect to see vertical score marks on the stanctions themselves as opposed to general pitting.