I've purchased three WM8804 MSL 3 chips, which came in a sealed moisture-sensitive package with instructions to mount the chips on the board within 168 hours of the bag being opened. However, it is not possible for me to mount all three of them within that time (I'm doing prototyping right now, not production).

Basically, I know that the first chip will be fine (I'll mount it right after I open the bag). However, the other chips will not necessarilly be mounted 168 hours after opening (there may be problems, I might need to order new boards, etc.).

I don't have the equipment necessary to "bake" the chips, and I'm not doing reflow (just hand soldering). Are there any ways I can prolong the 168 hours (storage techniques, etc.) in order to prevent moisture damage to the unmounted chips? Or is it fine to simply reseal the bag after use?