Hi Dom and welcome to the JRA. I suggest that the first thing you do is to take a few photos of the boat, out of the water, showing its profile and put them in a photo album you can create in your profile. Also we need to know the weight and dimensions. At first glance, an 18 ft boat that carries a 60 hp outboard doesn't sound the most likely candidate for a junk, but with more information, people will be able to make a better judgement.
Mauritius sounds like a lovely place to live. Lucky you :-)