I'm working on my first series of puzzles and would love some feedback for any of you that give them a shot.
This first one would be found next to a box with a 4 digit padlock on it. (you can assume it's to help you open the padlock).
I'm in a word but never seen
Japanese poets of me were keen
I'm used a lot to not seem dumb
But there's just three left where I'm from