Both of these statements make sense. To be grammatically correct you need to split them as they are considered two separate and complete thoughts. (A complete thought= subject (s)+ action(a)). I(s) have hidden(a) it somewhere. You(s) will never find(a) it. You could also separate them with punctuation when writing (comma/semicolon) or a conjunction when speaking (and, but, however, etc) : I've hidden it somewhere and no one can find it. A side note, "can" suggests the object no longer exists, "will" suggests that the speaker is confident the object will never be found.

They are basically the same statement.

Yes, both of these answers are grammatically correct and make sense in English.