I have some hatching eggs going out this afternoon. Don't usually ship this time of year but its for a New Years' Hatch participant. Supposed to start snowing this afternoon and be about 30 tonight and tomorrow night. The only heat packs I have are the big Hot Hands 18 hour ones that I use during power outages and for transporting chicks. My concern is that it might get too hot in the box. How can I put one in the box without the eggs getting cooked or started? Should I just skip it and hope for the best?