Acceptable screen crack size for trade in

I'm eligible to trade-in my iPhone 11 and it's in excellent condition EXCEPT one very tiny crack on my screen.  It is so tiny (maybe less than 2 mm) and it's hard to see unless you look at it very closely.  I know full-trade in value for iPhone 11 is currently $800 and with cracked screen, it's only $350.  I need to ship my phone for trade in and someone will review and issue me a credit after 3-4 weeks.  I don't want to ship it without knowing the exact trade-in value I would get for my phone.

Is there any policy or website that specifically mentions about acceptable crack size for full trade-in value?  Or regardless of the size, AT&T considers any crack as a "phone with cracked screen"?