OP, you have still not addressed the key issue which IMO is your only defence both now and ultimately in court: So i worked for amazon flex delivering parcels on this day,
While these matters are fresh in your mind...:
How many parcels of what size to how many residences on a site with, to be confirmed, a single car park and these residences were how many metres away from the car park and how does delivery take place e.g. to obtain a signature or leave at the front door or designated location etc. and was/were the resident(s) in/had they been pre-notified of delivery and how many return journeys did you make while stopped in the car park?
Others may have other questions.
IMO, unless you make a deliberate and accurate record now then in possibly several years' time a judge would be sceptical about your recollections because as far as we can see none of the necessary specifics has been put in evidence so far.
I had about 4 parcels in one concierge, and a couple that went to other separate flats.
Walking to the delivery point once I had finally found it from my car would take less than one minute.
I left it at concierge, the others the customer wasn't in so I rang neighbours flat number and left it at the lobby.
I returned to my car to pick up more deliveries more than once. Maybe like 3-4 times.