Is there wood?
No wood inside the box but you use it with things that have wood…
hammer and saw
Nope!
Glue and sandpaper
paint and brush
One of the objects has glue…
No!
glue gun and nail
So far few hints about what is not in the box. We need a hint about what IS in the box.
something heavy, something light…
I’m not in but want to say your planning on how this giveaway is to go down is very well thought out. Well done!
wood glue and applicator?
Type of products maybe?
It could be cannoball and horse shit. Such guessing isn’t big fun if there are no good hints 
my next guess is hammer and nail
It can be used as a hammer but it is not a hammer…
rubber mallet and nail?
would you tell us if we get one item right?
No glass. Technically tool. Heavy and light. Some metal. Glue. No electronics. Can be used as a hammer. Not edible. No wood. No cloth. That is correct?
Are the two items usually used together or are they unrelated to each other?
Glue tube and a rock.
Correct
The items are unrelated to eachother
would you tell us if we got one item right or only if both are correct?