I thought it was my trailer??

Yes this happened when we purchased a car for my wife.
We purchased it in July and transferred the rego as per usual process.
In February when the rego was due I was waiting for the bill and it didn't arrive.
Went into Queensland Transport armed with all of the evidence from our purchase just in case we needed it.

It turns out it was a typo error made by QT staff and it had been transferred into somebody elses name that had the same surname and a drivers license number that only differed by 1 digit. We did not know that person.

What are the chances of that?

It was a bit concerning to find that through no fault of our own we were driving an unregistered vehicle for a few days until I picked up that the sticker had expired.

Brett

Registration in QLD is NOT valid proof of ownership of a vehicle ,never has been , Bill of sale is required to establish proof .