Daybreak does have archives as far back as 1999, but not like you think.
For example, the recent patches Dzarn made to Live (That I considered porting over to P99) that fixed all the black spots on old models also put in a complete overhaul of animations fo most Luclin models that were originally intended to be the model animations at Luclin release but they changed them for one reason or another. It also put in several changed textures including a 'nightmare pegasus'
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New beetle and pixie textures (additions, not replacements)
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The missing High elf merchant models
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Kazon Stormhammer's unique model
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and King ak'Anon's unique model
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All of which had been sitting unused in a 'vault' since 1999. Never implemented for whatever reason. They also have the Firiona Vie unique model (minus animations) they used in a screenshot on the back of the Luclin box that never went in.
However, model and zone backups and archives aren't necessarily code. Point being they DO keep backups and archives tucked away from the days the game released, but if you're expecting them to have entire server code back ups that is highly unlikely, they may not even have EQMac's set up anymore. And that only sunset a couple years ago