After reading about how to identify fake Gillette Fusion refills I had to find out for sure. I purchased an eight pack at Wal-Mart. Guess what they have no serial numbers. I sent an email to Gillette Consumer Relations. In their reply they asked me to call them. After a twenty minute conversation I am still confused. The Lady I talked too said that some of their refills has serial numbers and some don"t. I didn't say I believed this but that is what she said. I am wondering if Wal-Mart is such a good customer for Gillette if she was just covering for them. Who do you believe?