Ditto what bbcard1 said with respect to opening an SGC case. small-medium flat head screwdriver, insert into a seam, twist gently till you hear a slight sound of plastic giving, and continue to do this along the seam. I popped a T206 out tonight and it took literally a minute and the case looked fine.
the BVG large Supplement-size holders are a PITA, on the other hand!
Rob