Fringe - Season 5 -

At the end of Season 5, after time is reset to 2015 and the Observer invasion is prevented, Peter finds an envelope in his mail from Walter.

Inside the envelope is a single slip of paper with a hand-drawn white tulip . Fringe - Season 5

While not paper, the team follows a series of Beta tapes hidden in amber by Walter to reconstruct the plan step-by-step. FRINGE Recap: 'The Recordist' - Give Me My Remote At the end of Season 5, after time

Early in the season, Walter finds a large sheet of paper filled with equations—the original plans for the machine to defeat the Observers—hidden in his lab. FRINGE Recap: 'The Recordist' - Give Me My

The "paper" you are referring to is the drawing that appears in the final scene of the series finale, "An Enemy of Fate". 🌷 The Meaning of the Paper