The exceptionally rare Cocteau Twins vinyl box set is commonly known as Box Set One, although that title does not appear on the release.  Released in 2010, on 4AD, it was limited to just 700 copies.

The box set includes remastered versions of: Garlands, Head Over Heels, Treasure and the gatefold double disc version of Head Over Heels and Sunburst and Snowblind - 5 x vinyl in total with 2 copies of Head Over Heels. Sunburst and Snowblind is said to be pressed on dark violet coloured vinyl.  All vinyl is described as audiophile quality - 180grms. 

All the vinyl is sealed. The box of the box set is not sealed - not sure it ever was. 

New.

"Scottish dream-pop trio Cocteau Twins later this month will reissue their first three albums and a bonus EP on audiophile-quality, 180-gram vinyl in a super-limited 5LP box set with new artwork by 4AD’s famed Vaughan Oliver. Due out June 29 through Vinyl 180 and limited to 700 copies worldwide, Box Set 1 includes Garlands (1982), Head Over Heels (1983) and Treasure (1984) — the latter of which will be reissued individually for the first time that same day — plus a double LP set of Head Over Heels packaged with the band’s 1983 EP Sunburst and Snowblind, pressed on “dark violet coloured vinyl.”