i have to say very few people would have thought Ginger was a stray due to being on the large side. There is a cat that lives a few streets down from me that I would see out at all times and in all weathers, once it was freezing, so I picked him up and took him home for the night (he was sat outside a house in darkness, and he was skin and bones), he did smell of spag bol though, so I knew he had an owner somewhere - I went knocking on doors the day after, and he lived at the house next to the one he was sat on, they were concerned he hadn't come home, as he liked to have a last trip outside!! They had thought that due to him being 15+, that is why he was so thin, I explained it is normally due to health reasons, and got stopped in the street a few weeks later and was told they had taken him to the vets, and he had a thyroid problem. So, another happy ending.
Just done a bit of working out, and I think Ginger has been doing some work - before he went, the bulk of my fosters came from owners, since he went 8 out of the 11 (excluding the kittens) have been strays, only 3 have come from owners.