Anything you type, in cut-out magazine letters. A ransom note is words cut out of magazines and glued down one letter at a time. Nothing matches, and that is the point: no handwriting to recognise, no typewriter to trace. People fake the look with a font, which is the one thing it cannot be. What you are looking at is not a typeface, it is evidence of a hand. So every letter here is a photograph of a real paper cutting, pulled at random from a pile.