Better read the letter carefully. First they determine if the pistol originally had a serial number, then they decide if it was accidentally removed, and with virtually all the markings removed it does not appear to have been accidental. It appears that the Y in property may still be on the left forward part of the receiver, but the picture is too dark to tell.
Similar to what Forrest Gump said, it's like a box of chocolates, you never know what you will get. Maybe they will issue a new serial number, and then again they may not.