HELP! Large speakers fell over during shipping.

Bought a pair of Dali Euphonia MS5 speakers. They must have fallen over during shipping. They were upside down on the pallet when they got to my house. 155Lbs for each box.
My question is, what could have happened internally? Could drivers be harmed? Crossovers? I refused delivery, but now the seller wants them re-delivered so the insurance agent can look them over. I never took them out of the (destroyed) boxes, but now I’ll have a chance to, and check them out. What should I look for (even if they still sound good)?
Are you sure the seller didn't accidentally ship them upside down?  Not sure how they could flip over when packed on a pallet.  ( or do you think they fell off the pallet and the shipping company put them back on the pallet? ) 

If there's no cosmetic issues with the cabinets, I bet you will be ok.  But you will want to figure out if you can get replacement boxes in case you ever want to sell them on your end.

Nope I had shipper send photos before, just in case this happened. He even wrapped them together in shipping cellophane (which had been removed by the time they reached me).
DON’T EVER USE ESTES SHIPPING COMPANY!!! I paid $800 just for the shipping. At least the seller bought insurance.
Typically, the speaker will be suspended within the crate.  If they experienced a violent impact the woofer cones could be damaged as the magnets have quite a bit of mass. 
What a nightmare heh? You wonder how a company whose sole task is shipping could FUBAR so much.
The problem with crating is they assume a forklift will be used and that everything will be kept upright. Cardboard boxes actually work better because they require padding all the way around. That is for example what Tekton does. They are marked UPRIGHT but because of the way they are packaged it hardly matters.

Anyway with crates they can do things like bolt the speaker to the crate using the speakers threads. These are intended for floor spikes, not for holding the whole speaker up in the air upside down or sideways. Subjected to these kinds of loads they can pull out, leaving the speaker to bang around inside the crate. So look first for damage to these thread inserts.

If these are really strong and don’t pull out then the next thing that can go is the cabinet. This wasn’t designed for side loads either. So inspect carefully along every cabinet joint, corner, and edge. Of course it kind of goes without saying the driver cones, but you would spot that immediately. About the only thing there is soft dome tweeters can dent in and pop back out and it looks horrible but does no lasting damage and after a while even the crease disappears.

Almost always the crossover is build on a piece of MDF. Caps, inductors and resistors are simply zip-tied or hot-glued to the board. The board in turn is hot glued to a cross brace or something inside the cabinet. From the crossover wires go to each driver. There’s foam or batting in there. Bottom line, nothing in there to be damaged. The one thing that could happen is the board breaks off. Stand the speaker up, and tilt it to one side and then the other. Anything loose inside will shift around and you will hear it.

As far as the drivers being shock damaged, could happen I guess. What happens is the voice coil gap is very very small. The voice coil fits in a gap formed between the outer magnet and the inner pole piece. It takes a lot of force to do this but it is possible to shift the pole piece enough to freeze the voice coil and destroy the driver. (Ask me how I know!) The test for this one is simple- tap on the cone. If it moves freely you are good to go. Won't work for tweeters but if the woofers and mids are good they are far more massive and subject to damage so if they are good the tweeters should be as well. 

This is all from actual experience. My Talon Khorus were crated. They had to send THREE to get ONE here in good shape. All the damage explained above happened to the others. Now I know why Eric uses cardboard and styrofoam.