Anozie handed his finds to the Nigerian Department of Antiquities in 1946. Other artifacts from his compound were collected by Kenneth Murray, a Surveyor of Antiquities, in 1954. But it was archaeologist Charles Thurstan Shaw who opened three formal excavation sites between 1959 and 1964, naming them Igbo Richard, Igbo Isaiah, and Igbo Jonah. What emerged was staggering: more than 700 high-quality artifacts of copper, bronze, and iron, along with approximately 165,000 glass, carnelian, and stone beads, plus pottery, textiles, ivory beads, cups, and horns. The bronzes included ritual vessels, pendants, crowns, breastplates, staff ornaments, swords, and fly-whisk handles. One water pot, set within a mesh of simulated rope cast entirely in bronze, astonished specialists. The surface detail was so fine that tiny insects appeared to have landed on the metal, though they were not attached separately but cast as part of the original piece.

The art world struggled to place what Shaw had found. Peter Garlake compared the bronzes to the finest jewelry of rococo Europe or of Carl Faberge. William Buller Fagg described their strange, almost Faberge-type virtuosity. Frank Willett argued that they achieved a standard comparable to that established by Benvenuto Cellini, the Renaissance master goldsmith, five hundred years later. Denis Williams called them "an exquisite explosion without antecedent or issue." The initial reaction in some academic circles was disbelief. Scholars speculated that the bronzes must have been created after European contact, positing phantom voyagers who might have introduced the techniques. Isotope analysis demolished that theory. The metals were of local origin, and radiocarbon dating confirmed a ninth-century date, long before any European reached the region.

Between 85 and 90 percent of the copper ore used to produce the bronzes originated from mines near Abakaliki, about 100 kilometers from Igbo-Ukwu. The alloys are chemically distinctive, with an unusually high silver content that sets them apart from bronze traditions in Europe, the Mediterranean, and other African centers. A small percentage of the ore may have come from secondary sources, possibly including North African locations like Tunisia or Morocco, based on lead isotope analysis. But the most dramatic evidence of long-distance connection came from the beads. Analysis of 138 glass beads revealed that the most common type was soda-lime glass produced using plant ash, a composition consistent with glassmaking traditions in Mesopotamia and eastern Iran. These beads likely traveled along the eastern Niger corridor by the ninth or tenth century, evidence of trade networks that linked this corner of southeastern Nigeria to the wider world.

The Igbo-Ukwu finds dismantled a framework of colonial-era assumptions. Scholars had long held that sophisticated metalwork in sub-Saharan Africa must have originated through contact with Europe or the Mediterranean, and that complex artistic production required hierarchical, centralized states. The Igbo, however, operated in an acephalous society, one without kings or centralized authority. Their political organization was egalitarian and community-based. That such a society produced bronzes rivaling anything in the contemporary world forced a fundamental reassessment of what kinds of social structures could generate technical and artistic achievement. Archaeological evidence of iron smelting in the broader region reinforced the point: furnaces dating to 2000 BC have been excavated at Lejja and to 750 BC at Opi, both in the Nsukka region about 100 kilometers from Igbo-Ukwu. The metallurgical tradition here was ancient, deep-rooted, and entirely indigenous.