1）不可以.前面一句don't need 其实是don't need to buy的省略.没有必要之意.后面一句是有语境的,可以表示 不需要也可以表示没必要的意思.不可随便替换.
2）是她已经被他们找到了,所以不用去找他们了.
3）就是单纯表示没有必要的意思.
最后加一句,感觉你对情态动词的用法不太清楚.其实英语不要太抠某一个词啊什么的意思了,那样会限制自己对其的理解.好好学习,收获更多吧
（1）we mustn't buy things we （don't need）和No,I （needn't ）这两个可
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