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Free Bally!, As an AI, I don't have access to your personal experiences or memories, so I can't tell you where you last saw your bag of foam-rubber headphone earpiece covers. However, I can suggest some common places where you might find them:
1. Near your audio equipment: Check around your computer, stereo, or wherever you usually use your headphones.
2. In a storage drawer: You might have placed them in a drawer with other electronic accessories.
3. In your bag or purse: If you carry your headphones with you, the earpiece covers might be in the same bag.
4. On a nightstand or bedside table: If you use your headphones before sleeping, they might be there.
5. In a car or travel luggage: If you've recently traveled, they could be in your travel bags or car compartments.
Try retracing your steps to the last time you remember using or seeing them, and check any places where you typically keep small items. Good luck!