Relative to the original post, and more pertinently to the link provided by Big Biz, I was enquiring as to where the bonus track was in the scheme of the provided archive file, otherwise known as 'the release'.
'The release', as you will notice, is sans the aforementioned bonus track that you sagely noted has been widely available for a number of years.
The consequence for the end user-- selfishly manifested and represented in this argument by yours truly-- is that any attempt to imitate the full and correct tracklist for the digital version by just placing a copy of the bonus track (sourced alternatively, naturally) into the album folder would render the provided checksum file almost obsolete, at least. More saliently, personally, that course of action would inhibit the ability to add the album to any music database management software or HTPC database without first having to alter ID3 tags and ensuring they correspond to the format employed by the original files provided by Big Biz. Extra steps I'm not particularly keen on taking (read: can't be bothered to take). The main reason I download 'scene releases' that conform to 'scene' rules.
This is before we move onto the possibility that said bonus track may have undergone changes in the interim from it's first appearance publicly to its point of sale. Mastering, lyrics, music, etcetera.
As you can see, there are a number of reasons that make my enquiry as to where the bonus track is perfectly valid and reasonable, mahfukka.