It takes more than a minute to go online and organise an authority to leave!  I had a parcel come by courier a few months ago and I found the courier's website extremely hard to navigate.

An ATL might absolve the courier company of any responsibility but does it absolve you of all responsibility in ebay's eyes if the buyer chooses it?  Is an ATL proof of delivery in ebay's eyes, or paypal's?  That's the question I'd be asking.