Hey man.
It might decrease the value of the thing you get back in return.
Look at my because color 20" frame. The frame was quite scratched, especially on the downtube, not a single dent or crack etc though.
I had a disc brake on for like 1,5 month and the disc tab cracked. Because of the scratches on the downtube I got 50% of the frame prize on the because frame too spend at tarty. Like if the frame costed £100, I got £50 back (example)
I'm happy enough though, good luck with your warranty claim:)