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Do you have a photo of the crack before it was repaired?

Apple Technicians have access to a document that provides instruction on how to classify (in warranty / out of warranty) display cracks. There are actually plenty of display issues that look like the result of physical damage, but are instead categorized as 'in-warranty' by Apple's documentation.

Reach out to me at my username at gmail.com, I can maybe help you if you have a photo of the screen before it was replaced.