It's unlikely that temperature or humidity issues during transit caused the crack.
If the guitar took a hit during transit, causing the crack, it is likely there are internal braces cracked. I'd send it back and get my money refunded. Whether it was packed properly or not, it's the seller's problem.
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2009 CA Cargo Raw, 2006 Collings OM-1 SS light build, 2004 Taylor 714ce, 2000 Taylor 310K, 1991 Martin HD-28, 1971 Martin 0-18, 1967 Guild F-30
2006 Ovation Legend 6756LX 12 string, 2004 Taylor 354ce 12 string, 1976 Guild G312-NT 12 string (dreadnaught shape)
1966 Martin T-15 tiple, Mele koa ukulele
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