Main panel cover...anything missing?

Is there supposed to be a corner plate on this GE exterior service entrance panel? (This is the interior cover.)

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I would think so. I would say that it is not safe.

Is that a meter enclosure and panel, looks like it to me. If so there is another shield that goes there to keep utility power (unmetered) from your side when doing a bottom feed

Yes.

From those angles, looks like a good rodent/bird nest area. Not safe.

Agreed

It had an outer cover.

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