lots of companies sell the boxes and foam containers. They should not be having such a gap, I would have returned them as defective and asked for replacements. The company I get my shipping boxes from is called Cold Ice. I believe they sell to the public (?) - I buy at cost through the packaging company I work for. Have to buy full bundles which means my snake room racks are piled high with foam coolers (the solid piece with a top style is what I prefer) but it's nice to always have them handy if needed.
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