I might have misunderstood but what do you mean by "also done 'fixes'" ?
And, getting originals from authors is always something to look for, but the author
1. has not the original material anymore
2. grabs a rip lying on [pick your favorite music collector] web site and overwrites sample text
3. has the original but dislikes a few notes here and there and updates at will, then releases it as "the original".
4. has the original and shares it as is
most likely is 1) of course
... I've seen 2 and 3 .. believe me ! And I've seen 4 also, thankfully
