My actual removal company didnt even supply me with 'removal' boxes, they gave me loads of second hand boxed from shops, so I got to recycle

Plus if they are from furniture shops and stuff they are designed to carry heavy stuff. Plus loads of differnt sizes are usefull for when you have lightweight big stuff, or small heavy stuff.
In fairness wobbs, when you dont have a car, how would you expect to be able to get a load of empty cardboard boxes to your house otherwise?