Great news, my local council outlawed or out regulated throw away plastic food containers so everything is not in waxed cardboard. Which holds up about as long as the food is actually safe to eat. So win win.
Wax gets soft when heated, so I'd be really surprised if the cardboard you're talking about is actually using "wax".
Australian politicians too weak for stuff like this.
https://www.vic.gov.au/single-use-plastics
Other Australian states* have either already done this or have it in their legislative pipeline.
( * except for Tasmania )