hasn't he, or wasn't he?

Technically, it would be

He must've been here, mustn't he?

and

Aren't both of the above mentioned correct?

I know what you said is correct saying, but are the other two ways of saying right?

No, actually they aren't. You may find this explanation helpful:

http://en.wikipedia.org/wiki/Tag_question#Auxiliary

thanks, though I 've heard "....hasn't he" before.

Yes. It's possible to sayhasn't he, but not in this particular sentence. You could say, He's been there, hasn't he?

He must have been here, hasn't he? No.
He must have been here, wasn't he? No.

He must have been here, mustn't he? OK.
He must have been here, mustn't he have? OK.
He must have been here, mustn't he have been? OK.

Note, however, that native speakers do not use tag questions like this very often. In authentic speech tag questions are much less used than your gramm

Thanks a lot