How to locate clean-outs

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We had new carpet glued to the basement floor a ago and didn't catch the fact that the guys capeted over the storm drain clean-outs. With recent quick thaw here in MI, we got water seeping up over the basement floor, which I am suspecting the drain tiles are clogged. Now I can't locate the clean-outs.

Any suggestions as to how find them? I though I would try a rubber mallet and tap for a hollow sound???