It is still in the original packaging.
'Confezione' — con-fe-TSYO-ne. The 'z' is pronounced like 'ts'.
State this proactively to strengthen your return claim. Showing the item is unused and in original packaging makes the shop assistant more willing to accept the return and often speeds up the process.
'Ancora' means 'still' here (not 'yet' as in a negative sentence). 'Nella' is a contraction of 'in + la'. 'Confezione originale' is the standard phrase for original packaging in Italian retail contexts.
Non l'ho usato/a.
I haven't used it.
Simpler statement of condition.
È intatto/a.
It is intact.
More emphatic — stresses it is undamaged.
Ho tutti i pezzi.
I have all the pieces.
Important for items with multiple components.
In Italy, opened cosmetics, food, and software cannot legally be returned once unsealed, unless defective. The original packaging is your best ally in any return.