That happens sometimes. I've taken stuff home and later learned they were GF, it's all about learning, and remembering the Loupe!! I've also had it go the other way once, where I had a bag of some 10k and 14 k, and some that I was sure we're 1/20-14k marked so I bartered way down arguing that, and they turned out to be solid, cause I read it wrong. I try harder now to be correct, cause I felt bad later.