I definitely got within a few meters of this hive without problems. However I don't know how reliable a diagnostic that is. I have no experience with the Africanized bees; I know they are often aggressive, but I doubt their aggression is universal in all circumstances.
Well if you can go within a few meters without problems, what do you care about them beeing africanized? If you have africanized bees, with reasonable low agression - no problem. If you have non africanized bees, with reasonable low agression - no problem. If the behaviour changes towards more agression, you have a problem. But as you don't want to breed them, the reason behind this change won't matter to you.
I'd suggest, you promise to your land-owner to check every week or so, if the bees still behave calmly. As long, as they don't make any problems, just leave them be.
If they actually start to develop agressive tendencies, ask a bee keeper, what to do about them.