No mate, S is right thats not what I meant!! I cant answer for Luibaka though.
Obviously my humour doesnt translate well !!!!!
And though its not what I meant ,on the serious side of your comment, OP have a number of 217 and 127 casebacks as replacements. I was offered a used gen once but was outbid. It wasnt in great condition but I didnt mind as the weight is whats makes the real difference to me for a franken....
FYI - The question obviously arises about SN etc but OP have set procedure on this, I understand the replacements have everything engraved but the SN is blank, as they do with shadow cases or pre-production runs. This is then inserted when replaced.