Adorecream said:

The egg was built much later than the rest of the complex, sometime around 1998 - 2000 from what I read. The Playground was built in 1990 for some of the children that belonged to NPG members and I read too that after the Ahmir thing, it sat there for a few years gathering dust until around the Rave era it was bulldozed.

The egg was built after 2000, probably 2001 or later. It was not there during the Celebration in 2000 because the playground was still there at that time.