The DCR ( range ) for the 2215B kit ( used in the le15a ) was speced as
8.1R to 9.5R ( according to the 1978, JBL "Transducers Test Specifications" sheet / published by JBL's Quality Assurance Department ) .
The figures are ancient ( ie; back then the speaker still came with a LansAloy surround ) and were no doubt subject to some revision with the move to foam surrounds .
Your buyer is under-educated on these matters ( while you should have included 2 pictures of a DMM showing the DCR of your two woofers (
in this eBay sale!)