Birchbox Customer Appreciation Day 2019 or Birchbox CAD is coming September 18, 2019 from 12-6PM – celebrate with great sales, giveaways, and offers. Plus, four new limited edition beauty box from Mankind, Beauty Expert, BeautyFix and SkincareRx! Birchbox – We’re celebrating our 9th anniversary the best way we know how: with Customer Appreciation Day. Official CAD is on 9/18, but get ready for awesome sales, giveaways, and surprises all month long! This post may contain affiliate links. Read the full disclosure.