Having Jimmy'd our way this far, we take a stab at removing the vibrator.

When it's not being pulled apart for inspection, the vibrator works in tandem with the PagePress triggers built into the bezel.

Since the triggers themselves have no moving parts, the vibrator gives taptic haptic confirmation of all your page-turning commands.

After doing our IC identification homework, we can report that this is no ordinary oscillator or motor, but rather a piezo haptic vibrator, perhaps manufactured by AAC Technologies?