Seems too young to be sold. At 16 days old, the bird is likely hungry during the night or lonely.
If the bird has food in their crop, then offer a little ¨buddy¨ to sleep with, a small stuffed toy (like smaller than a tennis ball), with no loose part, no threads, buttons etc or a rolled up clean sock in a ball.
This bird will need feeding around the clock right now, just remember to allow the crop to empty once completely per 24 hours.
Where are you keeping this bird? Could you
post a picture of your set up?
What are they eating? I think Lories need a specific food, I know I have seen many brands make a formula only for Lories.