I don't know whether this applies to Australia, but I have had the experience of the Ministry of Transportation in Ontario assign a (17 digit, meets current pattern) VIN to an ex-military Sankey trailer as a replacement for the original number that was on the data plate when I bought it from Crown Assets.
Perhaps there wasn't an original data plate for your C15 and "the system" assigned a number? This is only a suggestion, no idea how likely it is to be correct.
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