You know, if a seller explained the query as you have and said sorry, my mistake but I didn't realise  etc, I wouldn't have a problem with it. I might feel a little disappointed the item wasn't as fast arriving, but I wouldn't overly worry and my feedback would be good (if I liked the item).

But the way the buyer explained it, it sounded as if the seller said it was a mistake in the listing and it 'shouldn't have' said express.

Now that would be annoying to me personally because maybe the seller didn't mean to leave in the words express post.

But the fact is, they did.

So many little problems can be headed off at the pass with good communication.

I can still remember the one and only time I ever gave negative feedback. A seller had sold us concert tickets but when we drove 30 minutes away to pick them up, they weren't for the date advertised, he had made a mistake in the listing. I decided not to give any feedback as it was an honest mistake.

Then the next week I opened up my ebay to find he had put in an unpaid items dispute against me! I was absolutely livid, fuming. I gave him negative feedback on the spot, plus replied to the dispute. He rang me up, very upset, couldn't understand why I wouldn't withdraw the negative as it was a mistake, he had forgotten what had happened with the tickets. But I replied that if he had just emailed first and asked when i was paying, before launching into a dispute without asking, I could have cleared it up.

Communication is everything. Well, it helps, anyway.