I live near the intersection you describe - a week or two ago I saw people meeting this description, very early in the morning (6/6.30 ish), working from a large white van (something like a large Transit, high roof and long wheelbase). One man driving, the other walking the sidewalk ahead of the van and foraging through skips (there are two on the street at the moment)- anything of interest he placed on the sidewalk and van man stopped and quickly picked it up. They were moving quickly so by the time I realised what was happening they were gone - both men medium height, dark brown hair, olive skin. Not much more to go on I'm sorry, but by the sounds of it they are along regularly.