Trustee sales happen all the time with the homeowner thinking everything is on hold. You can lose your house if you don't get on top of the problem quick.
Your best bet is to call BofA and see what their position is or go to the Assessor/ Recorder's office and see if your property is on the list for the 21st.
BTW, my records show that 25 houses in your zip code are scheduled for auction on the 21st. If you want to shoot me an email at StopForeclosure@HomeSalesSally,.com with your address, I'll be happy to check it for you.
Any way as far as you not receiving notice, the court should have notified you, as well you should be tracking the case online.
Check with the clerks office at the court house where your foreclosure was filed they will be able to provide you with the information you need.
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Try contacting the clerk of the court in your local county to see if the auction has been set.
Also, if you have the name of the auction company try calling them directly.
Hope that helps.