This story appeared in The Star on 25 Sept 2014. It describes how the fake eggs had a rougher surface and were larger in size than real eggs. The yolk of the fake egg was more yellowish and there were no signs of chalaze, which was the opaque ropes of egg white holding the yolk.
The fake eggs most likely originated from China.
Fake egg shells were made of chemicals such as calcium carbonate while the egg yolk and white were made of sodium alginate, gelatine, alum, benzoic acid, calcium chloride, water and other chemical components similar to what had been discussed online.