Not quite on topic, garner,   I don't even know what a game thingy is, but presumably you have been sending as a letter as you say you have no tracking.

So would it be worth your while to invest in the Aust Post new prepaid envelopes with tracking?    If you buy 50 it works out at $4.35 for a cardboard envelope with automatic tracking.     It would stop this nonsense that buyers get up to, claiming non-receipt.

https://www.ebay.com.au/itm/Domestic-letter-with-tracking-Large-Prepaid-Envelope-Pack-of-50/17355290...