they are 279's and have minimal value on or off cover.
I will partially disagree. The majority of the on-cover examples will indeed have modest value, but the "postal history" aspect of the full covers has the potential to make them worth considerable money due to the cancel, sender, recipient, ads, enclosures, etc. The 1 cent stamp tends to get used on 3rd class ad circulars (junk mail) and has a low survival rate. Do not remove the stamps from the covers. Try posting scans of a few covers you find most interesting.