Alienware M14 - took apart to clean, small piece reading 330 fell out

I took apart my Alienware laptop to blow out the fan with some compressed air today. I undid the two spring loaded screws to get to the back, a small piece immediately fell out that reads 330 and 164p9 e on it. I proceeded to unscrew and pull out both the battery and hard drive. That's it. Then I put everything back together and realized I had this small black tab (looks like it has wires and could be a module of some sort) left over. My laptop seems to be working fine. Sound, video, etc. where does this go?