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If there’s a plate it might be from another bike, ie stolen, or it’s got a plate but no ID card then you’ve no hope unless you know who’s name it’s registered under.
I know someone who took a supposed “lost ID card have plate” moto (2016 Dream) to try and get it registered and after they said he’d have to pay import duty (but he didn’t have the import papers) they confiscated it as it “might be stolen” and as he couldn’t prove it was his he lost it.
Old plates can be purchased, but unless you paid a lot, then just ride it in the meantime. Sell it for cheap when it's time to move on. The odds of being stopped are low. What kind of bike is it? They won't have any of that saved up in an easily accessible database.