A retail display case is mostly glass in a slim frame, which makes it fragile and awkward. Remove the shelves, mark the glass, and carry panels on edge, and you avoid the shattered-corner disaster.
Pro tip: Number the glass shelves and note their slot heights so the case merchandises the same way at the new store.
Watch out: Never carry or store large glass panels flat; unsupported glass flexes and cracks. Always move glass on edge.