Delivery drivers in the UK regularly do this. They get to 11am, realise they won’t meet the delivery slots for the afternoon deliveries, so bulk mark everything as delivered and sign themselves, then take their time and deliver after the slot later that day.

This is illegal. Signatures are legally protected in the UK (and elsewhere I’m sure) and forging a signature is a crime. I got like 3 Hello Fresh deliveries in a row when I complained of their repeated forgeries before I cancelled.