The most obvious place was under the floorboards, of course. Expensive Niffler-skin rugs were dotted all over the floor, but Hermione crawled methodically over every inch of the glossy wood. Most of the boards were firm and silent. But – yes, there. One of them near the desk gave way slightly under her weight, and upon closer inspection she saw that it was a slightly lighter colour than its neighbours. Using a penknife from the desk, she levered the board up and examined the hollow she had uncovered.