https://www.blowoutforums.com/showthread.php?t=1315750
Check out this thread about the trimmed cards that are showing up on the COMC site. A couple of months ago I brought up this subject on BlowOut and I was pretty much ignored, and I was told that COMC charges an additional fee to make sure that cards are not altered.
I also brought it up in a thread on Net54 when the COMC blog was raving about HawkDynasty, who is one of the alleged trimmers, submitted 6000 graded cards to COMC.
Be careful if you are planning on buying a graded card from COMC.