yep well vented
when dry ice melt or off gasses,,,,,,C02 is the product
i would think a good cooler and some dry ice
i killed a buffalo and we picked up the meat at the packer in the afternoon,,,it was frozen,,, put it in the 5 day coolers,,,,3 large ones,,went to the motel got up early and drove home,,,7 hrs,,,,,so meat was in the cooler for 20-22 hrs,,,,was still frozen hard as a rock when i put it in the freezer,,,,it was december,,,so now would be a good time to move it
so i would think if it is frozen and you put it in good coolers with some dry ice,,,wouldnt think it would take to much dry ice ,,,,it should stay frozen for a couple days no problem
another trick i have used is to wrap the cooler in a wool blanket,,,,or like said earlier a movers blanket,,,,
my .02
ocharry