I was just reading a thread in the Trees forum, where several people stated maples are difficult to root as cuttings, and are generally best propagated by seed or air layer (with the exception of vine maples). This leads me to believe you should be okay with using them. Personally, I've never been successful getting a cutting to root, but I have limited experience, and only with Japanese maples.
If you want to be sure, it wouldn't hurt to leave them out in the sun to dry a few days before using them. After 3-5 days, they should be too dehydrated to muster th energy to produce new roots & leaves.
Another thought would be to put them in the ground upside down. I don't know if it is applicable to the Acers, but I know my roses and several other things I propagate will not be successful if I put the wrong end in the soil.
