One item I read said that most of the “surviving” Greek statues are in fact Roman copies. There are a few like Milo or Nike who are missing pieces, but full complete is rare.
As for Egypt, another Item I read said that in terms of cubic yardage, Ramses II beats everyone else in history hands down for statues of themselves. It helped that he was a living god, hence needed worship material for his subjects, lived into his 90’s and ruled 73 years.
It’s more apparent on the reliefs in Egyptian ttemples, but the early Christians and then the Moslems took the “no idols” thing seriously. Many of the Egyptian reliefs and statues had the faces and sometimes hands chiselled off. Many survive from neglect, having been buried in sand until the modern era.
(Also brings to mind that the nose isn’t the only obvious protruberance often missing from ancient Roman statues. Back when many computer programs required a serial or USB dongle to run, to prevent piracy, there was an ad for a program that would emulate dongles; it showed an nearly-intact Roman statue of a unhappy male nude with the caption “Lost your dongle?”)
Also important to mention the Terra Cotta Warriors in Xian - lost for two millenia, a replica of an entire army
Estimates from 2007 were that the three pits containing the Terracotta Army hold more than 8,000 soldiers, 130 chariots with 520 horses, and 150 cavalry horses, the majority of which remain in situ in the pits near Qin Shi Huang’s mausoleum.[2] Other, non-military terracotta figures were found in adjoining pits, including officials, acrobats, strongmen, and musician
Since they were put in troughs covered with wood beams, in many places the beams had sagged or caved in. One area of the museum is busy re-assembling some of the soldiers from fragments. It appears that they had an assembly line making the basic shapes, and then each individual head and some clothing and armour details were customized to reflect the individuals in the emperor’s army - so actual, individual portraits.