The only sources I can find are that 1.1 million physical and digital was sold, not shipped. Or at least I'm not seeing where it says the 700k was sell through while the 1.1m was a different measure. Both seem to be numbers announced by SE themselves.
Also, the 1.1m was in November 2016, the 700k on May 30, 2016. The game was released in January for Japan. After 5 months, I'm guessing the sales were almost negligible.
As evidence, it didn't chart at all on top 50 for media create for may. The 20th game on MC sold about 2.5k copies each week. Even if DQ builders was selling 2k copies a week, thats 8k copies a month. For June, July, August, September, October, November, thats a measly 50k by the most aggressive estimation. So while it sold over 700k, I'm not sure how much one can say "well over" 700k, and it seems clear that NA and Europe were 300k minimum of the 1.1m in November. (Edit: as pointed out below, I forgot the rest of Asia, which apparently liked DQ Builders. So I guess it's still unclear how well received it was in the West. Though as friendcode mentioned, Europe didn't seem too keen on it.)
Once the 1.1m number was announced, they did release greatest hits versions in Japan, which I'm sure did help move more units, but that was after the 1.1m announcement.
However I can't read Japanese so perhaps I'm going off poorly translated Japanese Press releases -- if you know Japanese well, please do share.