[Translation from Japanese to Native English ] If the price can be lowered by not including something like the book or knife...

Original text

本やナイフが無ければ、価格を安くすることができる場合は、本やナイフは必要ないです。
しかし、セットで販売しても価格が変わらない場合は、セットで購入します。
オリジナルの箱は必要です。

Translation / English

If the price can be lowered by not including something like the book or knife then I don't really need them.
If the price won't change even if they are sold as a set then I'll purchase them as a set.
I do need an original box.

Translation / English

If the price can be reduced if the book and knife are removed, I will make do without the book and the knife.
However, if they are all sold as a set and removing any items wouldn't change the price, I will purchase the entire set.
I will like the original packaging.