Yes, it does look like a collar indentation. While he might have been dumped, he could also have slipped his collar and actually has a home. He looks to be in pretty good condition. I had a big orange ex-tom, dumped by neighbors, who used to slip his snap-collars all the time. I'm going to assume with all your experience that you will be posting "found cat" posters.
Your rescue friends shouldn't mind at least posting him for you. Within my rescue group, it's always a relief when a new rescue turns out to be a young, friendly marmalade boy because they are usually adopted within a week.
Glad you were there to whisk him away to a friendly foster place. Have you considered getting some skunk oil and sneaking it onto your neighbor's logs?
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