The only way to solve the mystery was to ask her mom to open the mystery package, and so that's exactly what Taylor did. To their shared delight, it contained Taylor's purse; and that's not all it contained. Nothing had been taken from the purse at all.
All her cash was there, and so were her important documents. Taylor would have been ecstatic if that's all she'd received back, but there was more. The purse had come with a letter from the finder.