Just think what they could do to your stash.
You would probably have to either wash it all in hot lysol water, or just plain throw it all out.
That is why I no longer go to garage sales. You nevesr know where you could get them. Like someone said , it has nothing to do with being clean, if they latch onto you, you take them home and they multiply.
And they are so tiny that you can hardly see them.