Are you in the UK? Royal Mail are absolutely terrible for shipping trees. Every time I've ordered anything from the UK via RM, the package was absolutely caved in and open.
Note for the future, if you mail order trees, only do so in the winter (not even late winter/early spring). They will be dormant and have no issues with foliage. If you order early spring, the tree might exit dormancy in the box (like the black bag method which forces growth pushing), and will have lanky, pale growth that dies off, wasting energy, potentially fatally.
As for time spent in shipping, it can be in transit indefinitely if it's winter and the pot is wrapped in plastic wrap. I've had a tree two months in the mail and it survived and is thriving.
BTW, in my experience, German sellers will almost always package in wood packages or will use a wood frame inside the cardboard box. Hats off to them!