the messages are generated automatically by system
why should we reply to it?

if i remember it is

i cannot be sure 100%, if not wrong...the confirmation including the picture is submitted onto the system
thn the system send it to your whatsapp

if the delivery guy needs to manually save every number of every parcel and whatsapp you the picture every time
his phone contact list guarantee extremely long and the job load of the delivery guy guarantee a lot more than just delivering stuff