SCF Through The Mail Manager: Bravo2004 has just reported a success:

From: Keith Hernandez (Baseball) Success %: 20% (1)

Submission was sent on: 09-25-2018 and took 9 days

Comment: Sent 8x10 with letter. Askedf or him to write '!979 MVP", but it came back with just his signature via fine point blue sharpie. Good enough for me!