Owen,
i got your address, I have less than 50 posts so i can't reply by PM.

I confirmed it is a SX-610, I don't think it was ever mounted, It has scratches since last year because I put it in the junk box.
Unfortunately, I don't see the RD hanger, google search return a lot of RD SX610 without the hanger as well. I have a Falcon 5 DR with the hanger may be you can try. I will send both to you tomorrow.