Hi.
First of all an 83 cabrio is a mk1, and an 84 Golf is most likely to be an 83 mk1. If it actually is a mk2 from '84 its a very early one, and as mk2's were never officially sold in Australia until '89 in 5-door GTI spec exclusively (all others are imports), i'd say it's highly unlikely that it would really be a mk2.
Unfortunately no-one here will be able to seriously make any attempt at estimating the value of them without some pics at least, let alone an actual physical look over. Its kind of like asking "how long is a piece of string?".
I'd say just go and have a look yourself and if you're still not sure, take some photos and post them up here. Then someone might be able to offer a possible "valuation".
But even then its just going to be a rough idea. They are worth whatever you can get them for!!
Good luck!
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