I wouldn't be too concerned about the lack of government response. Things work a whole lot slower in South America - give it another week at least, then fax them a reminder.
I'm not sure about some of the cultivars on that list, but Ouro are what are called "Oritos" in the Spanish-speaking world - they're little gold-ripening bananas. I didn't realize they were a Brazilian cultivar! They are very tasty, again superiour to Cavendish or Gran Nain.
Roxas are what we call here Rojitos or Rosados - they ripen red on the outside and pinkish on the inside, and are fatter than regular cavendishes, but about the same length. I personally prefer the flavour to that of yellow bananas, but very few growers sell their Rojitos so I've had a problem getting trees locally. If you don't have them already, I'd encourage you to get them!
2 Cachos (2 bunches) might be the Praying Hands variety, or it might be a re-bloomer; I don't know enough to tell you, as I've never grown them myself. They're sometimes in the markets and they're square yellow bananas.
Velhaca are what we call Seda (silk bananas.) Again, better flavour than export Cavendishes. A bit bigger, too.