Congratulations on getting the partial discount, but you technically didn't get the wrong papers.
You see, cards from that era that go to ADs typically came with blank warranty cards. The salesperson was supposed to fill it out with the relevant information at the point of sale, but commonly weren't. The only way you know that this card didn't come with the watch originally is because someone placed the barcode sticker that goes on the shipping coffin on the back for some unknown reason.
shipping coffin sticker:
So if you peel off the sticker and resell it claiming it is a full set, no one could claim otherwise. In fact, if your seller had peeled off that sticker before sending it to you, you wouldn't have known either. So the partial refund was more than generous.
You can't do the blank warranty card pairing any more with the new METAS watches as they are all printed from the factory. Even the Pictogram cards have serial numbers whereas they didn't previously.
Now if you want to see a REAL incorrectly paired watch with the wrong warranty card, check out this Japanese listing I was looking over. Cool precious stones on a basic steel Planet Ocean GMT, bro!