The car I’m about to purchase has no air box and the seller has told me .. I do not need an air breather box ? I was told I do not need one. Any help would be great that.
Run, don't walk, away. The breather box is often quite a complex system with MAF sensors etc inside as well as the air filter. If the air filter is missing, your car is breathing all the gunk that gets caught by the filter - not good. Over time, the extra grime will wear the engine out. If an important sensor like the MAF is missing, the car will run badly anyway.
You don't state what the car make and model is, but I can pretty much guarantee that there are better options out there - with all parts intact.