Be honest with them, and most importantly yourself when negotiating. Always use the scale system. You know if the box is a 5/10 or a 10/10. If it’s a 7/10, ask for 30% and be happy with 20%. If it’s a 5/10, then ask for 50% and hold your ground.
You have to follow my formula though:
1. Be honest with yourself and rate the damage 1-10 (this will determine the discount)
2. Take many pictures and immediately offer to send them in (they actually want to see them)
3. Tell them your a box collector, you never open the box, but you display the box so the condition is very important (you’re an adult, not a kid, and you’re paying premium prices)
Here’s a recent example. This box is definitely a 5 and they offered 20%. I said 20% doesn’t make sense and if I had to return, that would cost my time and money to do so (returning is not a free process for yourself). I got the 50%..