I splinted a B. tuldoides culm bent over at about 6 ft off the ground by the wind before it hardened. The nodes above the bend have put out branches and leaves.

Many bamboo vendors ship a clump of 2 or 3 culms, truncated leaving only one or two nodes with branches and leaves, since the reduced root system can't support the nutrient/moisture demands of all the foliage of the full height culms.

I've seen culms pushed over by kids at ground level, with the bend point being pretty well spintered, but the foliage of the entire culm stays alive and green with the culm lying on the ground.

I don't think your bamboo will have any problems surviving the transport damage. It may not make it for other reasons, but for the that damage.

Get it planted in rich soil and keep it moist.

Your bamboo will be fine, but the parts above the breaks may die. Bamboo culms are not like other plants, and culms do not regrow if they are broken off or pruned. You can try splinting, but I'm sceptical. If it were me, I'd prune to just above the culm node below each break, and accept that it will not be until next year that you will get new, full-height growth. (If you don't prune back to just above the culm node, you'll have a hollow tube above the node that collects rain water and may promote rot.)

as long as it's not completely severed, keep it hanging on for as long as possible. the broken parts on top still have carbohydrates and starches or whatever in them still. That is something that the "goood" parts of the plant can still use. once that top part is completely dried and dead, you can cut it off for aesthetics.