Looking at Kevalino's original post, he stated along the lines that the puppy was cowering in the roadside, weak, bedraggled, and need of food and water. The perfect reason for taking the puppy into care. Had he not done this, it is more than likely the puppy would have been dead by the morning. To me it was obvious it was dumped, for someone to find.
Yes, I agree, posters would be a good idea, and Kevalino has indicated he has done this, and has made contacts with others.
To me leaving any animal at the roadside, on the excuse that it might be lost, is stupid. To take the animal, and ensure its survival and safety is the human thing to do.
Kevalino, well done mate. By the way have you seen the following weblinks. They maybe able to help.