In the above mentioned context,
Look into something: investigate, to inquire into
- Look into a question.
- The governor asked the police commissioner to look into the case.
Look at something: examine
- We must look at the question from all sides.
- Doctor, will you please look at my ankle?
- Will you please look at the battery of my car?
Usually, "look at" and "look into" are interchangeable. In such cases (of interchangeability) "look into something" suggests a more thorough examination (of something) than "look at something".
In the sentences you have provided, "look at" and "look into" can be interchanged.