In general digital album sales are pretty low in Japan.
But A Complete is going to reach 100k eventually.
Afaik it's around 50k something on Oricon's chart in total.
Edit:
This is the chart from last week:
Though you have to add what it sold before Oricon started its digital album chart about 2.5 years ago, so it must be a bit higher already.
Not many albums have reached a digital certification yet at all.
If you wanna check out, I regularly update the thread in the Asian Music section.