When someone kindly rear-ended my car (and promptly drove off) the boot floor was damaged but a boy-racer bodyshop local to where I used to work fixed it for about £100. Knocked all the panels straight but being box-section they will never look "original" again.
Sorry to see that. It looks like it is just a bit too much damage to be a cheap quick fix - obviously it is not a "dangerous" level of damage but it does look like it has given it a bit of a good "shove".