Despite the randomness, walkthrough has been very reliable. Currently in the middle of Arthur's part 2.
Right now, everything's ground to halt during Johnny's first aid side quest. Like you mention, the suitcase didn't have all the ingredients, so I've been traveling all over looting where I can. Unfortunately, still haven't found 2 medicated balm. At this point, I'm probably going to skip this quest line until I either find the balm or find another first aid kit. This aspect of the game is just asinine.
If the first aid kit you mention during Part 1 is always there, I recommend putting a warning or infomessage note about saving it for this quest. Either hold without using or put in the pneumatic stash. Just to save others time.
Edit: Found the Medicated Balm...and also the recipe for it somewhere?...after looting the Thomasina house.
- Turn left as you enter the house and go into the room. Loot statue #1 from the desk at the back of the room.
- Return to the entrance and climb one set of stairs, looting statue #2 to the left here. Open the vent behind the desk and crawl in to drop aggro.
- Follow the vent to the other side and then loot statue #3 from the top of the shelf to the left.
- Then open the door to the right. Proceed straight ahead to the window and look up and to the right behind the curtain for [Mask 12/20 - Yellow].
- Return to the entrance hall and head up the left set of stairs, looting statue #4 from the small table in front of you.
Probably should move #2 after #3 and the mask. And move the vent instructions at the end of #1.
Make sure the time is after 7pm and then use the mushroom to open the doors.
During the Mystery House quest, doors didn't open until 9pm.
Head down the stairs and straight ahead where you will a strange vehicle zoom past.
Minor typo during tunnels section: "you will
see a strange vehicle"