I'm not the first owner, but it doesn't look like it's been down the road. Just the usual dings and scrapes. It is the alluminium/silver one, not the black one, if that makes any difference to you.
Yes, I got the mounting plate and bolts from ebay. Wasn't cheap as there are not too many of them about. Also in "functional" condition, IIRC (haven't taken it off for last year since I put it on the bike.)
The keying thing... best say "no" I suppose. It is a bunch of [fiddly little] key-gate/inserts I was lucky enough to be able to re-arrange to fit my key. But, I don't have the other bits. [So it is a gamble really.]
I can take some pics if you want? PM me your email address . It would help to know what you think is the going rate / what are looking to spend too.