These tips on storing cookies are from Land O'Lakes.
For short term storage (up to one week):
Cool cookies completely. Do not mix soft and crisp varieties in the same container, or the crisp cookies will become soft. Store soft cookies in a container with a tight-fitting lid. Store crisp cookies in a container with a loose-fitting lid. Store bar cookies in the pan in which they were baked. Cover tightly with aluminum foil or plastic wrap. For long term storage (both frosted and unfrosted cookies can be frozen up to six months):
Cool cookies completely. Arrange in a container lined with plastic wrap or aluminum foil. Separate with layers of foil or plastic wrap. Tightly seal container, label and freeze. Thaw cookies by allowing them to stand loosely covered on a serving plate for about 20 minutes.
Merry Christmas from LR