What should a girl do if she got roses for Valentine’s Day by an anonymous person?

So for Valentine’s Day a woman at work received roses from an anonymous sender. She may have an idea who sent them. She took them home with her. I would think that she should have given them away or thrown them away unless she likes this person. Am I wrong with idea?
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What should a girl do if she got roses for Valentine’s Day by an anonymous person?
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