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A DVD case would very likely contain the finger prints of anybody who has touched it. It is exactly the type of surface likely to retain it.
However, the crown have to prove your guilt.
If a public wifi was used close to you then that points to you but it doesn't prove that it was you. It is equally possible that others could have used it. That isn't enough to form the basis of a charge. It is evidence that could be used in addition to other pieces of evidence. On it's own it is not compelling. Combined with other evidence it may be.
Similarly a fingerprint doesn't prove anything unless you have no credible explanation for how your prints came to be there.
Can I clarify anything for you?