Are they all leaves out? I agree with rcantor, if it has lots of leaves, you may remove some leaves.
I do not think that it is a problem, I ordered some young fig trees last June/July hot summer, It arrived 8 days in non A/C postal truck ( 4 days in truck, 3 day at processing plant), All in one sealed cardboard box, soil is dry peat moss/perite( not wet), trees was ok but recovered quickly.