I do not expect the news or the government to tell the truth about the findings in general.

Nuclear stuff is still, to this date in the USA, treated as "Sensitive Information" which may be "Classified" under a number of laws which require gagging/nondisclosure/censorship under the guise of "protecting our National Security."

My partner is a former employee in that sector. The amount of information that could be ordered to be protected in this way is likely more than you'd expect.

Oooh the containers were used to transport waste and then sold? My guess anyways

Furthermore the article clearly states:

Testing on frozen shrimp from the distributor, Indonesia's BMS Foods, also tested positive, the FDA said.

The shrimp was in fact contaminated. But as a precaution; with anything Radioactive, it is always presumed that anything that is in contact with a contaminated object, is also in and of itself inherently contaminated.

I recommend you watch some Kyle Hill on Youtube; he explains clearly how these things work. Radioactive contamination is no joke. It is handled with this level of caution for a reason. It kills people quickly if left unaddressed.