You twice wrote "Hassleblad", deliberately or by Freudian slip... which already indicates the way to handle this sample.
Concerning fungus, this is hard to tell from such photo. For instance, some rubber foam shows decay this way, though that part at the left seems varnished, also some metal corrosion does so. Anyway, it does not look like fungus to me.
But I see at least another issue, that may become troublesome. (Though I myself got an SLR with same issue, not hampered by it.)
But as indicated above, if you feel at unease with that sample due to its state, try to return it.