Those hissers are like Dubias.. Slow. A barrier of thinly applied vaseline should keep them in the bin.
Oh, and the adults.. do make noise

Best let your son keep those in his room, and just use the nymphs..
Janie.
Naaaw not brave.. just that I'm unique

That's the beauty of this arrangement....his friend breeds all sorts of reptiles and insects. She has offered to give my dragons food at no charge, cause she said she is overrun with hissers. I don't have to mess with the adults! I'll just get the size I need to feed! Now in the future I may keep some and raise them up to be breeders, if I can handle the noise, lol.