Also in relation to my other post here your concern of data leakage actually is quite realistic and precarious. Hence I think at least one initial format should be done even on freshly purchased media preferable with a scramble pattern.
I have heard of people purchasing new data storage (e.g. usb sticks etc.) which held recycled chips from old phones. There were remaining data fragments found keeping images of child po… As everyone can imagine this got the new owners into massive juristic troubles as they had almost no chance for explanations.
So I think it is even quite vital not simply to use freshly purchased storage but apply at least one format operation.
The news source was our German news broadcast DLF (Deutschland Funk)
“Peter Welchering says that due to a lack of knowledge and missing experts (related to forensic jurisprudence), mistakes have already happened, for example in child pornography processes. Different processes had to be rolled up again, because the images did not come from the owners of the sticks on which they were found in hindsight.”
“The reason: The memory chips on the sticks were recycled and were previously used in smartphones. When recycling the data was insufficient or not deleted and were thus taken on the stick.”
In this case I do expect that generally all manufacturers using recycled storage has to assure to ship them cleared only holding the data they should.
Edit: