"If it was not Office-1, I would have taken leave" - is this correct?

English as a Second Language English Vocabulary, Grammar and Idioms
1

“If it was not Office-1, I would not have taken leave” - is this correct?

“If it was Office-2, I would have taken leave” - is this correct.

2

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I don’t know what they mean, but:

[i]If it had not been Office-1, I would not have taken leave.

If it had been Office-2, I would have taken leave.[/i]