We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "Davey" saying
something like:

I have always wondered if there is a service which you can pay for to
receive your parcels and you just go and pick them up when you are
available.

It's called Post Restante and any PO will do it for you, no charge.

You simply get the sender to addy it thusly;
Mr Ivor Biggun
Poste Restante
Large Willytown PO
Knobend
Burks.