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A bunch of keys was  found in my box.

was  -- in place of   were.
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A bunch of keys were found in my box.

Error :- WERE

Correction :- Was is used in place of were. 

Sentence after correction :- A bunch of keys WAS found in my box.

Reason :-
were is a verb which is plural form of past tense and it is used as  subjective.

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