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The verification of poured concrete walls can be effectively accomplished by checking for a smooth surface and the absence of seams or blocks. Poured concrete walls are formed using concrete that is poured into forms, resulting in a monolithic structure that typically features a uniform surface. This lack of seams indicates that the wall was not constructed using individual blocks or bricks, which would leave visible joints or lines.

Examining the wall color alone is not a reliable method, as concrete can be painted or finished in various ways that do not reveal its construction type. Measuring the wall thickness might provide some insight, but different types of construction can have similar thicknesses, making it not definitive in identifying poured concrete. Identifying branding marks on the walls can be part of an inspection process but may not be commonly found or might not provide clear evidence of the wall's construction method. Thus, the most reliable indicator of poured concrete walls is indeed the smooth surface and lack of seams or blocks.