Monster-in-a-box in ARR

[Recycler]

I'd love to see this concept implemented in ARR (inside of dungeons, caves etc.). This page sums it up pretty nicely:

http://finalfantasy.wikia.com/wiki/Monster-in-a-box
http://finalfantasy.wikia.com/wiki/Mimic_(Enemy)

It really added to my experience while playing other Final Fantasy games; currently, you can mindlessly open a chest. I think it would be nice to have (random) monster encounters. Discuss!