I know a guy on another forum who tried to relic a Les Paul Standard. He wanted the finish to check like an old one, so he put it outside in like 10 degree weather overnight, then stuck it beside his fireplace the next day. The guitar was not affected a bit (but we all realize how lucky he was that the neck didn't warp or something).
The point of that story is that:
1) Gibson's new "nitro" finishes are WAAAAY less nitro than they claim, and
2) If you bring the package inside and let it gradually acclimate to room temperature for a few hours, it will be fine. BTW, you should do this with electronic devices as well.