Snape coloca várias memórias na Penseira:
Snape pulled out his wand from an inside pocket of his robes and Harry tensed in his chair, but Snape merely raised the wand to his temple and placed its tip into the greasy roots of his hair. When he withdrew it, some silvery substance came away, stretching from temple to wand like a thick gossamer strand, which broke as he pulled the wand away from it and fell gracefully into the Pensieve, where it swirled silvery-white, neither gas nor liquid. Twice more, Snape raised the wand to his temple and deposited the silvery sub-stance into the stone basin...
Sabemos que, mesmo quando há muitas lembranças na Penseira, você só vê uma por vez. Nós também sabemos dos momentos finais de Snape que você pode depositar múltiplas memórias usando apenas um fio. Então é possível, até provável, que Snape escondeu essas memórias na Penseira, mas Harry nunca chegou a vê-las.