I don’t see that your other questions were addressed, so here’s my guess:
It looks like the picture shows a genuine BenQ, just not in the retail packaging. If so, you might have “B” firmware, perhaps B7L9, B7G9 - it depends on the date of manufacture.
My rebadged 1620 came with G7H9, manufactured Sept. 2004. This is really an OEM, in that it doesn’t have the BenQ faceplate and uses the “G” firmware. It could be that you get something like this - if this vendor buys BenQ as if to sell a “house” brand drive (quite a nice choice for a house brand).
You might get a bare drive.
Now, if you know the 'net well, you can find software. There’s free stuff that can burn, but usually DVD Video type stuff. For a general data burn you need a mastering application like Nero. My rebadge came with Sonic’s RecordNow, and while some here like that, it seems to soak up CPU attention. It’s possible your drive will come with that, but I don’t know this vendor.
If you do get a “G” firmware, take some care before you jump to crossflash - technically that voids the warranty, and you should probably hold off for a while until the drive “settles in” just in case there’s a problem.
To that end, the widely available G7P9 is functionally identical to B7P9. Even BenQ’s QScan will run with that - which is about the only reason you really want “B” over “G” - save the odd time that a version is out more recent that “G” has available.
Note, too, that not everyone is convinced here that B7T9, the most recent I’ve heard of, is any better than B7P9 (G7P9). “P9” gives you 4x DL speed, and many agree it’s still their best, though a few have reported improvement with “T9” - check the “T9” thread before you take the leap.
G7P9 is on my drive, and it’s working miracles here.