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On several characters I have found one reliably behind a level 3 door. And it tends to respawn, but I don't quite know what the timer is. So, with that one door, and enough time, you may be able to get all three like me.
/way #2151 30.3 54.8 L3 - Random Scribblings

Because no one seems to be explaining how to get to the upper levels in this area:

You can reach the higher levels by getting the Scattered Teleport extra action button. I suspect that you can get this extra action button by finding a clickable item in one of the rooms on the first floor, which gives it to you.

Once on the upper levels, in order to jump from platform to platform on the upper levels you can use the item Flask of Windward Steps, which I found as a clickable item in one of the rooms on the first floor. It gave me the extra action button Windward Steps.

According to a very helpful comment by blinkk244 here:

"If you get Scattered Teleport for moving across levels: use Scattered Teleport to jump to the desired level, then right click the buff to dismiss it -> this in turn will bring back the Windward Steps ability, allowing you to jump from platform to platform. If you need to go to a different level (above), jump down, get Scattered Teleport again, and repeat the process."

Please go there and vote this person up for this helpful comment.

Also THANK YOU to Nytemagick who mentioned the following in a reply to a comment (please vote her reply up too):

To get to the upper levels:

"There is a bubble stream, you have to find the bubble key and activate the device but once you do, you can go upstairs and enter a room that has jet packs so you can explore other rooms on that level, they are usable on the isle. I found all 10 notes."

Came in with nine keys and didn't see a single scribbling. Am I missing something?