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Old 03-08-2018, 08:52 AM   #2
Dragonling
Perhaps a thick strip of weather sealing foam glued to the edge of the lid? The kind you would use on the underside edge of a window. Heck, I'd put it around the whole thing. Make sure the corners are glued securely if you do this. Colubrids are crazy good at burrowing between layers.