make absolutely sure that anyone claiming to be a census worker has the proper ID. Scammers are going nuts this time around, even going as far as to mail out fake forms that send your private info back to them.

The fact that your entire building was "missed" sounds very suspicious to me, especially since I doubt everyone mailed their forms in at the same time. Post Office is far from perfect but c'mon that many forms, likely sent in over a period of time?

Be very careful! In fact a phone call to the Census board confirming that they are sending somebody out wouldn't hurt.