dennis,
Your removal of the clips that hold the halves together can be safely done by not prying the clip off and breaking off the bit of fiberglass that the clip catches on (ask me how I know) but inserting the flat screwdriver blade in the curved clip edge and prying it open and rotating it off with its tension off the box. There is a tool for this but....you know.

cushman

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Rare or not, drive it!