Nothing eBay can help you with here as to how couriers work, or where they leave items.
It's not just Evri at fault, I had a parcel delivered by Yodel yesterday , left on the porch, no one rang the doorbell , luckily an email alerted me ' an item has been delivered', otherwise left outside last night's big rains would have ruined the soft toy item.
I'm afraid it does seem to be the actual person delivering, not necessarily the Company , as our Evri lady who delivers to us is fantastic, and would never just dump a parcel and leave !
@domorowski1963