Ya. Keep it sealed for at least 12 hours. A warm box or case does not mean much .
I bought a sj200 2 years ago from eastern Canada. +5c. , had it shipped to Alberta. , here it was -20c I left it in the box for 4 hours. Being anxious, I opened up the box and case. They were warm to the touch.
The guitar nitro cracked everywhere. Im not sure why Gibson had to use so much product. The clear looked like cracked glass everywhere.