Do not exchange books when the machine is down! DO NOT take books which does not have a cover or label! If you do, get ready to be a victim.
The girl will take a note and tell you that things are all set. BUT when you go back, she WILL NOT find the note and obviously can’t remember what she said and ask for money!!! If you do take books while machine is down, take a written note and charge back when she tries to cheat you.
We can all help each other and read books.