My younger sister sent me books - please see details?

Anonymous
I'm a book lover and maintain personal library, though not big on one. All my friends and family members know it. A few days ago my younger sister sent me a bundle of books. I found some porn fiction, with explicit nude pics. I still wonder why didn't she remove these books or did she send unintentionally or knowingly?
Should I keep silent or talk to her?
Updates:
1 y
I am grateful to all friends who have posted very mature and nice suggestions.
My younger sister sent me books - please see details?
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