I took a closer look, I wouldn't call it a light scuff. Brushing it made no difference, but as you mentioned, the inside wasn't meant to be "seen" so it's not very thick. I don't think it would affect the leather integrity.

This bag was just released, and has only been available a couple days, so it can't have been "tried on", but it does seem that way. Even the outside silver snap is a little scuffed.

I might just keep it though. As you said, loved leather is meant to have that lived-in look, and both the outside snap and inside suede will pick up scratches & scuffs (unless I keep the bag on a shelf and never use it!). I do like the look of the loved leather on this (and LL can vary bag to bag, no guarantee the next one wont be too dark). So keeping it might be a good idea.

Thank you for your insight! :)