In general feminime nouns dont get "lo". The form with "lo" belongs to the masculine category of nouns. Thus you get: Masc: il- i, l'- gli, lo- gli.
Fem: la-le, l'-le. So, scatola, belongs in the la-le category.
I just got la scatola wrong in another sentence because I didn't write "case" now I get this sentence wrong because I wrote "case" instead of box. A case can be on a desk as easily as a box can be on a desk.