My JP Encore 01 Optimus Prime and Encore 03 Soundwave doesn't have the 5 alpha numeric digits punched on the box packaging, whereas the rest of my Encore series have. That's really strange.
I'm not absolutely certain where I sourced these two from, but I think Encore 01 Optimus was from a forum member and Encore 03 Soundwave was from an Asian (HK or Japanese) online store. Don't hold me to that though. And I don't use eBay.