You can't include marbles, action man, toothpaste, chocolate or sweets.
I box for 10 year old I put a rubrix cube, sudoko pad, Star Wars stickers, tennis ball, hair bobbles, brush, comb, gloves, hat, a recorder (musical), pencil case with pens, pencils, sharpener and rubber, note book, colour pad, felt pens, cuddly toy, flannel, nail brush, and dominoes in wooden case. In box for 2 year old I put in Duplo style blocks, building up cups, plastic drinking cup with Santa on, a ball, hat and a cuddly bear, musical phone, a flannel and soft toothbrush.
In my school I used to collect items and we sent over 100 boxes but since I no longer work there they no longer so it and I do feel sad about that. I used to do 12 boxes each year but as dh has had very bad health and been rushing too and fro hospital a lot have only made 2 boxes and donation this year.