Go South-west of the city on the same floor until you find a transportation sign on the minimap. Go through the doorway and you will end up in a train station. Walk south down the track and talk to Tegdak, who will give you a trowel and a specimen brush. Dig up the artefacts hidden in the floor by using the trowel on them. There is one north of the specimen table, one northwest of the specimen table and four south of the southernmost sample table. Clean all six artefacts by using an artefact on the specimen table—you will then end up with an armour shard, a hatchet head, a helmet shard, an ancient mace (Just called 'Mace' at the time), a shield fragment and a sword fragment. After cleaning those, talk to Tegdak again.