Call the Trustee number on the paperwork and tell them who you are. If you are indeed a valid lease holder, you wil need to provide your lease to them for review.
"The federal Protecting Tenants at Foreclosure Act (PTFA), signed in 2009, offers tenants the two most substantial rights related to foreclosures. First, it requires lenders to abide by existing leases; and, second, it requires lenders to give tenants 90 days' notice before initiating court action to evict them."
As for your landlord, he/she may not have known, unless they are the owner of the home. Also, just because there is a sale date, does not mean the property will be sold and if it is sold this does not mean that you have to move out immediately. (see above)
I am sure you are trying to enjoy your Holidays and now this. This should not be a worry, but a concern and not an immediate concern
If you need further assistance, you are more than welcome to contact me at 336-373-1881.
My company manages over 100 homes and this has happended to us three times this year.