I have raised all mine from day Olds and it is quite difficult to catch them, I would say unless you are really determined to know i wouldn't worry about trying to way s/he. As for the s/he and the quack a female quack is a loud quack, if I go near my 5 females they start quacking an it's almost ear puercing. If you try and catch Aflac and s/he quacks and it doesn't hurt your ears at least a little it's probably a drake, and if he doesn't have a curly tail feather he is probably less than 8 mo. That is when my drake got his anyway.
Sounds like Aflac. Quiet quack, but straight tail feathers...I believe s/he's still fairly young. Guess we get to wait & see. Thanks!
- TieDyeMommy