The R&B group from the 90s got big in Japan in late 90s as shown by Oricon figures below.
1994/12/21 Crazysexycool # 91 , 7 weeks, 22,190
1999/03/06 Fanmail # 10 , 33 weeks, 480,540
2002/11/06 3D # 2 , 19 weeks, 195,636
2003/11/19 Now & Forever-The Hits # 11 , 14 weeks, 163,999
TLC = Oooooohhh… On The TLC Tip = G = 100,000 = May-02
TLC = Crazysexycool = G = 100,000 = January-96
TLC = Crazysexycool = P = 200,000 = February-97
TLC = Crazysexycool = PP = 400,000 = February-99
TLC = Fanmail = P = 200,000 = March-99
TLC = Fanmail = PP = 400,000 = April-99
TLC = Fanmail = PPP = 600,000 = May-99
TLC = Fanmail = PPPP = 800,000 = August-99
TLC = Fanmail = M = 1,000,000 = November-02
TLC = 3D = P = 200,000 = November-02
TLC = Now & Forever · The Hits = P = 250,000 = November-03
The band 1992 album Oooooohhh… On The TLC Tip never charted. It still reached 100,000 a decade later as a catalog album. The most striking example of Oricon logic limits is maybe Crazysexycool, which totalled only 22,000 registered units – please notice if charts were a Top 90 instead of a Top 100 it would have got 0 sale – spread over seven charts. The reality is that once all sales considered, by February 1999 the record was up to 400,000 units. If we add later sales especially during the hyped Fanmail era, this record easily shifted some 600,000+ units to date, about 30 times its Oricon number.
Fanmail itself ends up massively deflated, this one due to import sales. Below is the album certifications compared to its Oricon sales up to the same date:
TLC = Fanmail = P = 200,000 = March-99 – 123,690
TLC = Fanmail = PP = 400,000 = April-99 – 257,650
TLC = Fanmail = PPP = 600,000 = May-99 – 348,190
TLC = Fanmail = PPPP = 800,000 = August-99 – 451,000
While it is normal to see shipments run ahead of registered sales upon release, during the following months sales must fill the gap. Yet, as we can see, the gap just got bigger and bigger. No imports data is available for this record but it appears absolutely obvious that it moved incredible numbers by that way.