Assuming it's a true pilsner with a lager yeast, it's far better to get it off the primary yeast soon after primary is done. All of the settled yeast and protein from the primary can produce flavor-active compounds that can result in off-flavors in your lager.
Since it is apparently a lager, it needs to be lagered in a "secondary" at near freezing temps. This can be done in another carboy or a keg. Some people lager in bottles, but I think bulk lagering is better for the beer.
Originally Posted by Trenchant
The only problem now is how to get the carboy out of the box so I can see how far down to put my siphon tube!
Just cut open the box with a utility knife... you can always tape it back together.