No, this is not taxable income for you. This was a gift. You personally did not win anything. You did not perform a service, you simply received money and gave nothing in exchange.
The W9 they had you fill out is likely for their records and standard procedures. Many times companies have blanket policies that people not in accounting follow so no one is missed for the accounting department. It could also be for other compliance purposes. You filling out a W9 does not make the income taxable. Gifts are not taxable to the recipient.
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