Photograph it once
Front, back, the card it came on. Your wall is your record: condition, where it came from, what it's worth to you.
Values stay yours
What you paid and what it's worth are only ever on your screens. Nobody you trade with sees a price.
Bring it to the con
Check in, wear your lanyard card, swap codes with no signal, and trade face to face.
Your invite code
From the person who invited you. It's on the invite they sent.