Old Woman at Hollister

This is sooo unimportant, but I thought it was weird...ok, so I am at the Mall at Hollister switching an item and they have two cash registers side by side...at the other register, beside me, there is this old woman who is at least 65 with a bottle of cologne...she has a receipt and claims that she purchased the cologne there yesterday and when she got it home, it was half used...the cashier confirmed that it had indeed been opened and scanned a new bottle...that is when it showed up on the screen that it was the wrong receipt...it wasn't even the same kind of cologne she had with her...now, go make up your own reasoning behind this...did she know that?? Had grandson set her up??? what exactly was her story???!!!!!