I thought I had seen a T202 end panel graded before, and I just spotted this CSG graded one on Ebay:
https://www.ebay.com/itm/29481444545...MAAOSwzjxiCyne
Being fairly shifted to the negative side of the anti-grading spectrum, my advice is to not bother getting the end panels graded. Yes the panels do have value, but since the two main companies do not grade them, currently a graded version probably wouldn't increase its value much.
End panels are fun to collect. I suggest you approach them as a collectible, not investment. Needless to say, the shown T202 end panels will not be headed to CSG.
Brian