Saying they don't after having said to another they do is contradictive and that still fits inside a $2 postage bag

I did ask about combined postage on the 2nd auction 2 days before ending and never got a reply it wasn't untill 5 mins after the auction ended and I messaged him saying I had sent the pay including shipping for combined postage that he then messaged back immediately saying that I had to pay individually. as for the sizes 1 would fit in a box 8x8x25cm with room the other 38x26cm