Ivanised Detection

[Dead Eye]

Now, according to the previous owner, my gen 1 has been Invanised... I'm fairly sure at the time he said it was the full monty, but my memory isn't fantastic

So, with that in mind, is there a simple way I can check for myself to see if it has been Invanised and to determine if it was the fully monty or just the slip-on?

Apologies if covered in another thread. I couldn't find a dedicated thread for this particular question and searching for invanising in general provides a plethora of results