The ones that were flying around your garage at the test were Barn Swallows. Cliff Swallows usually use a rock, brick, or concrete surface; and neither nests in cavities (like nest boxes). Your nest boxes will work for Tree Swallows provided the hole is big enough (usually 1 1/2") and the floor area is big enough (typically 5"x5").
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alacringa
"This Brittany is my most cherished possession — the darndest bird-finder I have ever seen, a tough and wiry little dog with a choke-bored nose and the ability to read birds’ minds." -Jack O'Connor
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