You are on the right track here:
GET /api/v2/notes/1
The Note you created was Number 1. You are looking for a note created before you created yours.
Kind of limits the possibilities 
Your hint really helped me. Thank you
Thanks, bro. You are my God. I found it.
please i have a challenge. in Burp Suite guided exercise, when i try to log in after creating the new user (teacher) with the password (p@ssw0rd) it keep saying Authentication error, thereby making it difficult to discover the flag for the last task
please i have a challenge. in Burp Suite guided exercise, when i try to log in after creating the new user (teacher) with the password (p@ssw0rd) it keeps saying Authentication error, thereby making it difficult to discover the flag for the last task. kindly assist. thanks