I sent several cards to SGC and I slipped in a trimmed card to see if they would catch it and they did on the first attempt.
I then turned around and sent the same one CAUGHT by SGC to PSA and it got graded.
I cracked it out of the case and sent it again to PSA a second time and it came back again with a higher grade.
Very strange why this would happen but now I know;
https://www.washingtonpost.com/sport...=.f4f1b1d13892
I have since cracked from case and consider the card a dead card since no one wants a trimmed card except as a placeholder like I have used it.