Gene Wengert, aka The Wood Doctor, troubleshoots wood related problems, and explores lumber and veneer qualities and performance, species by species, in Wood Explorer, inside FDMC's Knowledge Center.
To flatten the shelves, you will have to either quickly add a small amount of water to the opposite side, or, if the top side is still quite wet, dry this side quickly. The shelf will straighten and then you want it to go a little bit the other way. Then as the moisture throughout the panel becomes equal, the panel will be fairly flat. I cannot guarantee that every shelf will be perfect, but many should be close. Note: This process will work well with smaller items, but will not work too well on large items such as dining room tabletops.
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