"Sorry I can't, I'm going on holiday this afternoon for two weeks so I wouldn't want to risk them not coming back in time and being unable to retrieve their parcel for over two weeks"
This. I say I am going away for a week in about an hour and won't be able to give them their parcel.
Although I very rarely answer the door, so I don't get asked too often. It's only if they 'catch' me; like on the drive, in the garage, or pulling up in the car! But when I do get caught, I make an excuse and refuse.
In addition, I have known several cases of people taking parcels in for people, and the person whose parcel it was, contacted the company and claimed they never got it. And as the person who took the parcel in signed for it, the onus was on them. In addition, there is a chance the item could get damaged and you will be blamed. Also, there's the fact that you are obliged to go take it to them, or wait ages for them to come collect it, and feel obliged to chat/offer them a drink and so on.........
Fuck it, I won't take parcels in. On the other hand, I don't expect folk to take them in for me either, so I am within my rights to say no.
I appreciate the job of a delivery driver is not an easy one, and it's long hours and shit pay, and it causes them problems if they cannot deliver the package (or offload it onto a neighbour!)
But that isn't my problem.