Maybe, its because Indonesia is like that, as described by the OP.
We can't say for sure who did it, ...
Might not be QF staff at all, most likely its the baggage handlers, or even the security people, who knows whats inside bags from xray screening colleagues, earlier on in the check in process.
But, in the end, its just supposition.
OP using the words, QF, might not be the right words tho.
Maybe, Bali airport staff stole my items.
Might also be a "*roll", but who knows for sure.
From me watching youtube, it seems, that things, "just that things happen over there", that would not happen or lesser extend will it happen in Aust.
Money changer scams and other tricks, they play on visitors, also in Thailand, for eg.