We have a 3-day handling time and post the majority of our stuff by large letter untracked.

We have only a single late delivery defect on each of our accounts and this was becasue AP lost the items.

If you are using tracked parcels lodge over the counter, as had been suggested above. If the lodgement scan is within your handling time you will not get the defects or they will be easily removed by ebay if you do get them.

We mailed a large letter into our local red street box on Tuesday afternoon, with a priority sticker on the front. It was travelling from Brisbane to southern suburbs of Perth. The buyer messaged us today to say it had arrived. Less than 48-hours after we sent it.

That is actually faster than express as that particular postcode is outside the express network. Sometimes (rare) AP get it right.