Proper storage of macarons: Store in airtight container in refrigerator.
Shelf life of macarons: 1 week in airtight container in refrigerator.
Freezing of macarons: 3 months in airtight container. Can be frozen stuffed shells and without cream.
Thawing of macarons: 1/2 hour at room temperature. 1 hour if they thaw in the refrigerator. Tastes good frozen, because they never freeze up a 100%.
How can you tell whether macarons are good or bad:
Mold, bad taste or odd texture. If you doubt, leave it out.