Hello, one day ago I bought a coin from a coin shop in a city, where I study. However, I left it in my student room. I know, that I will not be there for over 10 days. The problem is that the coin is in a plastic cover/pocket from unknown plastic from the coin shop (something like in the picture). I don´t really know, what type of plastic it is. Should I be concerned about the effect of the material on the coin? I am afraid of corrosion (or maybe PVC damage) - I will not be there for more than 10 days. After that I will bring polyethylene capsule. SORRY FOR THIS POST, BUT I AM REALLY UPSET. Thank you all!!