If I am not mistaken, the Razorback is Locksley's version of the Javaline. If I am right, it is a 66" bow.
As I recall, there was also a Ben Pearson Rozor back in later years. It is a full recurve bow.
If I am wrong, one of the Ben Pearson GARU's will jump in here and correct me.
As far as the Darton goes, don't worry about the case, that's just a bonus. For under $60 you got a good buy.
With 11000 sales, I doubt the seller is a traditional bow guy. probably a pawn or collectible shop that sells all kind of stuff on e8ay. If so, they usually don't know the value of a bow, and their reputation on e8ay is important to them.
It is kind of like buying a pig in a poke. You are taking a chance, but sometimes you get a damned good pig.
Now, if you put as much time and effort into learning how to shoot it as you have into researching and buying it, you will be a great shot.
Good luck