These are restricted version and many no longer in production slip covers that were initially delivered around blu-beams (some DVD's - Will say DVD in title). Many are elusive and interesting slips, including special features, lenticulars Disney and the sky is the limit from there. There are classifications of Lenticular, elite and sneaks by $5. Assuming a slip is from a country outside the USA it will say that country in the title.
Mint Condition (10) - 1 corner with insignificant wear to no wear to the slip - I don't consider mint slips to be amazing as that is exceptionally difficult
Generally excellent - Mint (8-9) - Some corner wear or light surface scratching
Generally excellent (6-7) - Corner wear, surface scratching or little stamps. May have a minor wrinkle as long as the remainder of the slip is mint.
Great - Very Good (4-5) - Corner wear, surface scratching, little stamps and additionally minor wrinkle on the front or back. May have an enormous wrinkle on Back, however not a huge wrinkle on the front.
Great (3) - Usually weighty imprints, wrinkles, perhaps some little size tears, still an effectively intelligible slip
Poor (1-2) - Large issues that are normally recorded with the thing or a mix of weighty stamps, wrinkles and tears on a similar slip