Unicom is simply repeating information already passed by ATC or other aircraft.
Thanks Inbound I was about to say:
ATC: RXA667 IFR traffic, EA2136 Dash8, 10 miles behind same track as yourself, also WA267 taxiing Wagga for Finley.
RXA667: RXA667 switching CTAF talk to ya on the ground.
RXA667: Wagga Wagga traffic RXA667 IFR Saab 20 miles to the north east.............
WG CAGRO: RXA667 IFR traffic EA2136 Dash8........
RXA667: Thinking........No sh!t sherlock
