Last night I was doing COMC Challenges and empty penny sleeves kept showing up. This is the first time I saw a sleeve, I have seen receipts before but this one was new to me. The first 3 or 4 challenges I did had 6-8 sleeves in each challenge too, that was odd.
Usually I forget about the challenges but last night I put on my headphones, listened to music and just answered away. I ended up doing enough challenges to add $5 to my COMC so I am pretty stoked.