The fifth graffiti is inside Frank's camper / RV. After you have the control over Chloe back, turn right and you see between sink and refrigerator a list with the option for a graffiti. Note: Do this before you bring the notebook to Frank otherwise the scene is over.
00:08 - Optional Graffiti #1 (Stagehandwriting)
00:44 - Optional Graffiti #2 (Radical Piratical)
01:39 - Optional Graffiti #3 (Feels on Wheels)
02:17 - Optional Graffiti #4 (Canon Wall)
02:45 - Optional Graffiti #5 (Wishlist)03:23 - Optional Graffiti #7 (Tread Harshly)
03:53 - Optional Graffiti #6 (Friendly Forest Friends)
07:12 - Optional Graffiti #8 (Permanent Record)
08:38 - Optional Graffiti #9 (Vanity Fare)
09:21 - Optional Graffiti #10 (Creature Feature)