We bought a new house last year and there were two large gas tanks that
were full of propane for a gas fireplace that came with the house.
This morning a gas company came onto our property without our
permission and took the tanks away. They were at least half full of
$300+ in propane. As far as I knew these tanks were owned by the
previous homeowners and were ours.

Does this gas company (in Virginia) have any right to:

A) Come onto my property (inside by FENCED BACKYARD) without my
permission.
B) Take half full tanks without contacting me.

??????