The divider is so the cashier knows when to stop ringing more stuff up because it isn’t yours. If she moved the divider back afterwards, that almost implies that she wants to buy the persons behind her products. The story makes no sense, the divider is something you put up for yourself, it just happens to benefit everybody.

Sometimes the banks don’t approve the chargeback without a police report. The police report needs to be filed. Also, if it still exist, try escalating onto best buy forums, you used to be able to get to their highest level escalation team by doing that.