Help identifying a few things.

[Robb]

So like some of you may know, I repossessed this vehicle a while ago and started my build on it... I have wanted to ask this for a while now, but just haven't, so here we go:

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(I understand that it is damaged, I found this and if possible will solder it back on)

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What is that box??



Also,

Any idea what these two plugs are for?

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Thanks guys.