THEY DON'T KNOW by SO SOLID CREW has sold 300,000 copies in United Kingdom.
THEY DON'T KNOW certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 United Kingdom |
300,000 | 1x Platinum | 7 December, 2001 |
United Kingdom Sales: 300,000
Certification / note: 1x Platinum
Certification Date / sales as of: 7 December, 2001
|
| Total sales | 300,000 | (in 1 country) |
Total
Sales: 300,000
(in 1 country)
|
Year-end chart performance for THEY DON'T KNOW
| Chart 2001 | Rank | Sales |
| UK Albums |
80 | 270,000 |
| UK Artist Albums |
63 | 270,000 |
| Chart 2002 | Rank | Sales |
| UK Artist Albums |
154 | 100,000 |