Mine seems to be functioning as intended, though will keep an eye on the dates when the next public holiday approaches (it disappears for me as well, once marked as posted, and purchases made from Friday afternoon to Sunday were showing 'Post by Tuesday, 30th May', with a 2 day handling time, purchases made today were saying post by Wednesday).

Does anyone know if a similar note shows on the buyer's side? I don't have anything I need to buy to check.  But it would be handy if it does (on the other site I sell, the order details show the ship by date on both the buyer and seller's end).