[UPDATE]: CREDIT WHERE ITS DUE, QANTAS IS REIMBURSING THE UBER.
Thanks for the suggestions to speak to customer service and not the baggage department. It will help pay off the parts of pram missing.
Family was on a domestic flight, and our pram did not arrive.
The Pram was delivered 2 days later, Monday. We didn't use the pram for next 3 days and only used it last night - Friday. On opening its missing a few attachments worth $100. I filed a baggage loss claim but it was denied that any loss has to be reported in 3 days.
Is this standard? I thought 7 days in the worldwide norm. Are there any other options for me after this?
We had to take ~$200 taxi home as taking public transport without the pram was impossible with luggage.
Also called them to at least be able to check at the Airports or security if they have the missing parts found somewhere, because the way the pram was delivered it was clear the bag was opened and parts put together. But they had no intention of helping and just again reiterated the 3 day policy and asked me to call AIrport security directly

I would very strongly argue that you have 3 days from when you had your pram returned to you to make a claim. 3 days from collecting from the carousel, or 3 days from when it got to your house / you got home to find it at your house.
By their argument, they could delay an item by 4 days, then you have zero time to make a claim.
Escalate the matter.