CANADA
The Platinum award for After The Gold Rush is claimed on Billboard, 2 October 1976 (but not on Music Canada database, previously CRIA).

U.K.
BPI has American Stars'n'Bars listed Silver on 1 January 1976: of course that's impossible. For sure, the album spent 8 weeks on Top 60 and in its last week in the charts (released on Music Week dated 3 September 1977) it's still uncertified.

An unverifiable source would give a Gold to Time Fades Away in U.K., anyway not on BPI database.

U.S.A.
Rumors without reliable sources gives a Gold to Tonight's The Night and Trans, a Platinum to Neil Young (his first solo album) and Ragged Glory and a 3xPlatinum to Everybody Knows This Is Nowhere, then all decertified (???) or anyway disappeared from RIAA database
(it seems that also Emmylou Harris spoke about some decertified albums of her around 1990/1991 but, anyway, I have a list wich includes Jimi Hendrix, Bob Dylan, Roy Orbison, Clash, Rolling Stones, Queen and others, all not in RIAA database).

Record World magazine of 28 April 1973 and Cashbox magazine of 5 May 1973, wrotes about Platinum awards presented by Warner Bros. Records (and not by RIAA, of course, because RIAA starts with Platinum certifications in 1976) for each Neil Young album that reached 1.000.000 copies sold: supposedly those three albums are Everybody Knows This Is Nowhere, After The Gold Rush and Harvest (and I have pictures of the first two of them).
Other artists certified with Platinum from the label in the same period: James Taylor (two awards), Alice Cooper (three), Jethro Tull (three), Black Sabbath (two), America (two), Peter, Paul and Mary (five), Bill Cosby (five), and Dean Martin (three), as well as Arlo Guthrie, Allman Brothers Band, Rod McKuen and Anita Kerr (for the San Sebastian Strings), Frank Sinatra, and Seals and Crofts.

GERMANY
Platinum certification for single Heart Of Gold in Germany was claimed on Music & Media magazine, 14 November 1992.

A Lifetime Award for sale more than 2.500.000 albums to date, was given in August 1995 from Warner Music Germany, as of the picture in Music & Media magazine of 16 September 1995.

NEW ZEALAND
Harvest seems to be certified 4x Platinum in 1993 although it does not appear in the first book of Dean Scapolo (New Zealand Music Charts 1975-2000 Albums), but it's in the late The Complete New Zealand Music Charts 1966-2006.

U.K.
Harvest re-enters Top 75 on 9 April 1994 and is marked Silver, certification later deleted on next Top 75 appearance, 1 October 1995

AUSTRALIA
The 7x Platinum for Harvest in Australia is not on ARIA database, but is on issue 662 of ARIA Report, available on PDF.

CANADA
According to Music Canada (former CRIA) Harvest Moon went 5x Platinum but a WEA Canada reply at my request said different: that certification in February 2000 was accreditated to Harvest and not to Harvest Moon.

NEW ZEALAND
Despite my research, several certifications are without date of accreditation but looking at the two books about New Zealand Music Charts (1975-2000 Albums and The Complete 1966-2006) written by Dean Scapolo, Decade did not have accreditation in the first of them but its certification is listed in the second, the Platinum for Comes A Time and Harvest Moon appears in the second, and so the 2x Platinum for Rust Never Sleeps and the 3x Platinum for Live Rust. After The Gold Rush went Platinum but it is not in either of the two books mentioned.

SPAIN
According elportaldemusica.es Harvest is incorrectly listed as Gold and not as Platinum.

U.K.
During the summer of 2017 BPI website change his look and the Silver of 2009 for On The Beach (weirdly credited to Neil Young & Crazy Horse) suddenly disappeared from their database.

On 1 February 2008 Rust Never Sleeps went Silver and then Gold, but only the Silver is listed on BPI website.

ITALY
Gold certification for Heart Of Gold, reached adding audio streamings to digital downloads.

SPAIN
Gold certification for Heart Of Gold, reached adding audio streamings to digital downloads.

U.K.
Certifications for singles, all reached considering audio streaming.