A few months ago, I purchased a doujin album on YJA. The album arrived with all of the original artwork, but was missing the disc! Seeing as I have basically no recourse as a proxy buyer, I just chalked it up to bad luck.
Later, I bought another copy of the same album. Interestingly, I found that the album's disc was just a generic branded CDR.
This got me thinking that it would probably be possible to sell my discless copy, specifically by burning a second copy of the album, and including the burned copy with the discless original artwork (fully disclosed of course).
The question is: would it ever be okay to do this? My sense is that the answer is no. On the other hand, the alternative is basically to throw the discless artwork in the trash, since no one would want it without the disc. That seems kind of sad too.
If it's relevant, the album is 15 years out of print, and was originally sold at Comiket.