At the end of July they said that sales have increased in each region since E3.
For America & Japan, this sites numbers reflect that with an increase in sales from mid-June through all of July, NPD & Media Create also confirmed this.
On the other hand, this site shows that Europe had a 1 week boost during E3 week but quickly dropped below the pre-E3 baseline.
Oh Okok. Means switch might be undertracked in Europe. Those numbers are already great anyway