How do I know it’s not spoiled?

[Thea]

Welcome. Assuming the meat has dried and darkened to mahogany in your modern frost free refrigerator in regular use located within a consistently room temperature environment, the meat scientists all tell us “the nose knows.” Sniff the surface through the UMAi Dry®. You should smell a “blue cheese, forest, mushroom” funk, not “rotten.” Hope this helps.