The paperwork
Contact the shop.
sales@greybeard.games — answered by the greybeard himself, usually within one business day. Include your order email if it’s about a purchase.
On eBay
You can also message the shop through eBay as greybeard_gaming — same person answers.
What to expect
It’s a one-man shop, so replies come fast during the week and slower on weekends. For anything about an order — shipping, returns, a question about condition — you’ll get a straight answer, not a script.