Odd "leftover" cables...

I am helping an older neighbor sell his old high-end audio equipment, and among a PILE of cables I came across these two cables apparently (or maybe not?) missing their partners :(

I mean, I know Nordost Blue Heaven is popular stuff (I just sold some 3m speaker cables here) and I had previously sold some MIT Z-Cord-II Filtering Power cables and MITerminator speaker cables elsewhere, but a single Blue Heaven RCA and a single MITerminator 6 RCA? I wonder if he was using these together as an RCA pair for some reason?? Has anyone heard of such a thing?

Any thoughts appreciated!

PIC:   https://imgur.com/a/RLkQMI3