Oddly there is a legal reason too..When I had my settee delivered the delivery men unpacked it outside brought my settee inside and drove off leaving the packaging in the garden when I queried it I was told it was down to me to dispose of it
By law the packaging is your.. you bought it along with the setee.
Apparently the seller has to have in place all sorts of legal doodads which you should sign to say you give them permission to have it !
I came across it a couple of years ago when we had new carpets..
The stupid thing is, they could ( and did ) take away the old carpets no probs, but the plastis bag and cardboard roll they could not take ( though after a another cuppa and a bit of banter they did ) because I had effectively bought the stuff !