Oh, I'm so very sorry to hear this. MAYBE they they just wandered off and will return? A friend picked up some 10 week old chicks a few weeks back, and she picked up 2 for me along with hers. She was taking pictures of them (her son was holding each, she was taking pics) and one got away - son tried so very hard to hang on, but it got away anyhow (they hadn't been handled at all and were quite skittish), but it did come back the next day! Here's hoping for the same end result with yours!!