Issue: iShop "I have"

Well , since sometimes we don't really memorize the cards we have , i have bought or gotten the same card twice or even thrice
I go back to the "wish and thank yous" thread but sometimes i just do not have the time and it slips my mind to do it later .
So i would like to see a column or something that says "I have" so i know i already bought it or got it or some similar feature that allows me to know it without going through all of my cards carefully .

If we already have something please let me know because i haven't rally realized about it yet

And the thing is i could be breaking the rules for months and didn't even realize because i usually don't go through my inventory watching my "precious" , just when im going to pick the one i want displaying , so one of these days i might end up banned or warned for not having the time to review them carefully .