How often were you opening the box toward the end? 10 eggs in a shoebox sized tub, I would be opening the box every 3 or 4 days after 5 or 6 weeks, then every couple of days the last week or so. By that point you have living breathing critters that do consume fair amount of O2.

Having said that, my hypothesis for full term dead-in-eggs has long been related to the extra heat generated during the last couple of weeks of development. That many eggs, in that small a space could heat well into the mid 90s if the incubator was running at 89-90. Thats the main reason I advocated place the temp probe in the egg box to the other guy...

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