Thanks everyone for the suggestions - it was great to have my concerns validated as you start to wonder if you’re the unreasonable one! TM have been very helpful in terms of trying to find a resolution. I’ve emailed the buyer with the details and have given him a deadline of Friday to pay up or I’ll be cancelling the trades and relisting :)

He’s sent me pictures. It’s just one of the tickets you can buy from the post shop for various the rates and businesses can buy them in books. Unfortunately the items were all listed separately so I couldn’t quote on shipping beforehand as I only knew what he’d bought after the auctions closed. Maybe I’ll see if another company can do it cheaper as have only checked Aramex and NZ Post via TM and in store. I have asked him if he wants to organise the freight himself but he keeps ignoring anything I offer and insists I buy this lower priced ticket…