Klipsch Forte I

Hi. I need some clarification on my authenticity. 
 

I bought these used, in 9/10 condition…BUT

they were missing back tags, (torn off). In other words they are not numbered. The seller said that there were numbers on each speaker possibly INSIDE? They sound great, but could Klipsch verify them, and accredit each one in any way?

Thanks!

Dave