Thanks for the tip! Monica and I talk a lot since we live very close, so she was one of the first people I contacted about cold weather shipping. She did suggest using the polyester fill.
I'm feeling pretty confident. We won't be shipping them until next week at the earliest, so I'm hoping there is a nice warm spell before Feb 1. If not...we will pick the warmest day and hope for the best. It looks like the only major problems either come from incorrect packaging or a big mix-up on the Fedex end.