I use a "proper" 2x2 to store my coins, i.e.: half dollar in half dollar 2x2, etc. The hole in the 2x2 is just barely big enough to store the coin in. I was wondering if I could use a large dollar 2x2 for a half dollar. Is there "proper protocol" to which 2x2 to use. Will it make the coin more susceptible to dust or moisture? I staple on all four sides but have noticed some stapled in corners. Does it matter how stapled? I tried the internet for answers. I did find a How to use 2x2 on this Forum but didn't answer these questions.