Where does this negative cable go???

I have a 2008 GT that the previous owner relocated the battery to the trunk. There are ground wires everywhere in the engine bay. I found 2 that weren't connected to anything, one I was able to figure out where it went. However, the other I can't seem to figure where it goes or if it's even necessary. Need your ideas as to what to do with the ground cable. Thanks in advance!
 

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If the battery is located in the trunk, you need the vent hose to the outside like the Lincoln LS has. The battery has a nipple for a hose which vents the H2 outside.No explosion danger that way.