How to attach model to camera into certain position (first person view)?

Note: I am still completely new to unity and blender stuff.

I'm trying to attach mace I created with blender to first person camera so it will look like player is holding it. I also created an animation with unity that pressing mouse1 it will swing the mace.

I put mace into Main Camera/Melee category where Melee is an empty gameobject. I then positioned my mace to where I want it by looking into Game view. Then I created an animation and attached it to my mace. Animation works and mace is positioned correctly on game view. However when I hit play, my mace is not where it is supposed to be.

Any idea why? You can also download full project here.