Have you tried actually testing the lens yet...? Shitty shipping prep, yes, but they're honestly built pretty tough and can survive quite a bit of abuse. I'm a working photographer, and have seen gear survive all sorts of rough treatment.
I get that camera gear is expensive, but so many people on reddit seem to thing they're handling the Faberge Egg....
Put the lens on your camera and take some test shots... make sure the AF works and doesn't sound like it's broken. Shoot at various apertures and make sure that's working. If anything is actually wrong with it, it'll be obvious.
Aside from that, enjoy shooting with your new lens, it's a nice one!
Even if your lens turns out fine after doing some test shots, I'd definitely contact the shop you bought it from and let them know how atrociously bad the packing was... Might've been someone new and needs to be educated, or someone that doesn't care and needs to be let go...
I hope the test shots prove it to be in good shape!