My chicks are handled daily from a week old, so by the time they go to their new homes they are very hand tame and friendly. Chicks come with a family tree, and are rung with my personal ring number. They also will come with a care sheet and a lifetime of support from me.
I will give my best guess for gender, but only if I am over 90% sure! Some baby budgies can be notoriously bad for giving away if they are male or female! Gender isn’t guaranteed for this reason but I will be honest about any doubts I have.