AFAIK (please feel free to CMIIW), activity like opening and closing accounts doesn't stick around for too long on your credit file, probably not for longer than a year at most.
QFT. Dan said the same thing in one of his articles.
Im not sure what Dan said, but I look at credit reports all day long and heres how it goes:
-Any inquiry on your credit remains for 12 months- meaning I can see how many times you applied for any credit card, loan, mortgage, or any other time a financial institution ran your credit in the last 12 months. (If you run it yourself with myfico or similar, it does not show up).
-Any closed account even if only open for a month stays on your credit report for at least 5 years (maybe 7- I have to check) AFTER it is closed.
I am not saying that it affects your score if the account is closed- It doesnt really do much either way after 12 months, but it is still there. Unless you missed payments on the closed acocunt, then it still hurts you after 12 months.