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Help the over-prepared traveler reflect on his trip to the Sahara Desert. Select ALL the sentences that correctly express that he actually packed the umbrellas, even though it was a complete waste of space.
The correct answers are We needn't have packed all these umbrellas. and We didn't need to pack all these umbrellas, but we did.
Needn't have + past participle (needn't have packed) is used specifically when an action was performed, but it turned out to be unnecessary.
Didn't need to + base verb generally means there was no obligation. It doesn't strictly tell us if the action happened or not, so we often add a phrase like "but we did" to clarify that the unnecessary action was actually performed!