Hi Zuki,
Sorry to hear about your problem.
1) File the claim and don`t give-in !
2) Have the manager of your nearest UPS shipping location come to your home to see the damage, have "cost of KB " ready!
3) 2" ??? How did the KB get to you? The one that I got from "Music 123" came through "OK" , BUT I did request that they double box it and they refused saying that ALL of there "Yamaha , Psr2000 KB`s were shipped in just the box from Yamaha"
4) Tell that to the person who sees the damage. Tell them that is just the way "Yamaha" ships them!!
Best of luck, your in the "right" so your gripe is "A-OK" and they should make it right and pay for the entire cost of the KB. there could be other damage that you don`t see !!
Let us know how you made out, take care!
jedi