You could leave them as laid and see what happens.
Most keepers prefer the ability to more closely monitor temps and humidity.
Since they won't really be in the ground the temps may fluctuate too much (air around the laying bin) and you may have to mimic weather conditions ... ie: rainy season, etc.
Sounds like a lot more work to be natural to me. Much easier to put them in a controlled situation that will actually better mimic what would happen in nature.
-Brad
keep in mind, the above statement was made by the guy who just raised temps on his eggs by 8 degrees then back down 4 degrees ....