Key to open the box

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Across
  1. 2. telstra monthly letter
  2. 4. joyful
  3. 7. hole in a needle
  4. 9. not old
  5. 10. derivitive of
  6. 12. festive season
  7. 15. own
Down
  1. 1. drinking implements
  2. 3. more than like
  3. 5. 365 days
  4. 6. exam
  5. 8. Tipsy
  6. 11. derived from
  7. 12. your nickname
  8. 13. concrete does it on drying
  9. 14. First letter of the alphabet
  10. 16. also