When you say "cover"...are you referring to the album jacket? If the jacket is all white (no graphics), then you may have purchased a test pressing. Ideally...that's a good thing. It may have been a pressing made before the thousands of copies were pressed (for internal MFSL use). If that's the case it *should* technically sound better...assuming they didn't listen to the pressing, think it sucked, and decide to completely remaster the album and re-press it. :-)
seeking info from MFSL experts
I recently purchased a Bob Marley "Catch a Fire" MFSL Anadisc 200 LP. It was sealed in the traditional loose plastic with a tear off end but the cover is white. I was curious if anyone knows the history of these discs. Is it an early or late pressing? It sounds great by the way.