I have a hard time imagining the board can have left the factory like that. Probably it is from the shipping. Even though the boards are packer well, unfortunate things can happen.
Contact the shop from who you bought the board and have things worked out with them. If you have the packing left, you may want to inspect it and take some pics. Technically, you could have the tail smashed through the packing, but if the packing is damaged, particularly the piece of eps at the very tail, we can be sure its something that happened in transportation.
The cracking from the heel bumpers is normal. You can find it more or less on all boards and I think it is just some glue residue that cracks a bit when you push the soft pad.