It's probably fine. The batteries don't care about moisture, as long as the pins don't get shorted or corroded.

If they were wet enough to short, the symptoms are usually a completely dead battery or it seeming puffy, a.k.a. spicy pillow.

You can measure the voltage with a voltmeter if you want to check. It should read around 3.5 to 4V, depending on charge.

Source: I handle a lot of LiPo batteries at work.