... I was going to ask when do they ship ... and the other silly question ... the payment wasn't an Echeque was it...?
Realistically, it could be that the seller doesn't mark items as posted or will do it a little later. Tello gave an example of this when he had received an item the day before the seller updated the posting details. Since eBay are the masters of understatement, underthinking (and under the table) they presume the day the seller updates this info is the day the item was sent.
While not an illogical assumption, it does not reflect the way the real world operates and it would take a very disciplined seller to comply all the time.
If I were in your shoes Wheels, I'd probably ask the seller if it has been sent, since it does not show as having been sent in the listing details.