John in NM
Hi Ed,

Since your lumber is likely as dry as it gets, I don't think letting them sit for a week will see any change. If you have the same problem with lumber fresh from the yard that will sometimes do it if the bowing is caused by being wetter on the inside than outside.

You can build a steam box really easily. Just knocked together out of CD plywood with a pipe or hose going to a steam kettle. Hose has to be able to resist the heat of the steam, and should be fairly short to keep from losing all the heat. If you use metal pipe you can super heat the steam by applying a torch to the pipe (saw a neat demonstration in the 8th grade, teacher burned paper with steam by doing this).

You also may not need to remove the bow, depending on how bad it is and what the boards will be used for. Table tops and case work are far more forgiving than door panels