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Spray in place foam sold at home depot type stores works pretty good in those hard to get at places. If the fridge box in on the hull outboard, make sure to get some foam in between it and the hull which will otherwise transfer a lot of heat. If either of you have front opening boxes, a curtain of builder's plastic will help prevent too much cooling loss when door is opened. Same trick works inside a top opening box where you have separate freezing/refrigerating sections.
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