The shmura spelt Matzah we got from ______ was not as crispy as their regular, because they bake it earlier in the year. You have the option to rebake it for a few minutes if it’s not that fresh.
No self respecting supermarket or Matzah bakery will sell you last year’s Matzah. Maybe potato starch or other dry products that keep well from year to year they’ll re-shelve. And I don’t think deep freezing is cost effective for most Pesach foods.