Barcode letters of switches

[RA5]

Hello,

I want to know if the barcode letters of the switches must be exactly " T3A... " for " Mid 2018 to Mid 2020 " ? Or can that be " T5A... " ?

According to Cisco's identity counterfeit, I think " T5A... " is counterfeit, right? It would be great if you can help me.

Thanks and regards.

[Leo Laohoo]

If the appliance is suspected of being counterfeit, have a look at THIS.  

Look at some of the pictures attached to the thread.  It will provide a very good indication, particularly the hidden PCB.  
If the switch has a mini PCB underneath the motherboard, it will be counterfeit.