Shipping and finance news was important to businesses and travelers. That is why ship manifests and sailing dates/times were daily features of newspapers. Large gold transfers were often reported in business articles, even including which banks provided the gold, its purpose, source, and where on a ship the gold was being stowed. Telegraphic transfers via ear-marks were not usually reported - there was no physical movement to report. Treasury internal reports might include these transactions or just lump everything together as "ear-marks." Here's a sample from May 1928.