Don't worry, since it is 'mondatory' you only need to reply on Mondays.
The quality of English expression displayed in this 'notice' reflects poorly on our education system.
Edit: I notice that you are only required to comply if you are a beneficiary, not merely a recipient. Therefore the parcel must contain your inheritance or some form of gift or benefit before you are affected. Further, I am puzzled by the term 'final delivery'. What other sort is there? I've certainly never heard of a 'semi-final delivery' or a 'penultimate delivery' (except perhaps at the end of a cricket match).