There's no such thing as a dumb question.

" how do you know which are domestic and which are feral?"

You find out after you have shot them !!!

No, really there are not many places in Australia that have tamed camels
that run wild so generally you would be pretty safe to assume they are wild
and the person you are with should know anyway.

However I did HEARD of one person who saw a camel near a road, stopped, got out his
rifle, shot at what he could see of it (it was in a dip in the sand) and when he went over to it
he found it was tethered !!!

Not sure how true it is but it's a good story.

500 Nitro