Any and all such plats or blueprint, tracing, photostatic or other such copies of such plats heretofore affixed or filed in the manner provided in § 30-5-230 and duly indexed are declared to have been duly filed and recorded. The reference in any deed, mortgage or other instrument heretofore recorded to the boundaries, metes, courses or distances of such real estate as may be delineated or shown on any such plat or blueprint, tracing, photostatic or other copy thereof, heretofore affixed and filed in the manner provided in § 30-5-230 and duly indexed, shall have the same effect as if the boundaries, metes, courses or distances of such real estate were set forth in extenso in such deed, mortgage or other instrument.