Help identifying please

Help please on these cartridges
Headstamp is
ADI F3 99

Australian Defence industries

Australian Defence Industries (Thales), Benalla, Victoria.
F3 :5.56x45 Blank full profile case.
99: 1999 manufacture.

Very common.
Doc AV

Found at Mogo Nsw , can we tell what forces were there to give me a story??? Where they came from who shot them