To be honest, I'm not surprised your Defender was nicked, although I massively sympathise with you, its such a heartache when this sort of thing happens.
It looks like there's a ton of kit on it that could be sold on quite easily. Being so unique, it will prob have been stripped for parts. No criminal is likely to keep it as is, unless it's in an ISO container waiting to leave the country.
The problem at the moment is that people would rather spend their money on a new bit of bling for their Defender, instead of a decent piece of security hardware, be it a clutch claw, or steering lock. Some people still doubt the effectiveness of tracking devices and even basic car alarms. (subject to ISO's etc, before you all bite!)
A defender is easy to steal. It is your prerogative as an owner to make it as difficult as possible, for these ****ers to steal yours. This won't help get yours back, but it may give you some pointers for the next one.
Sorry yours was stolen, it does sound a bit dodgy, but then again, proving these things is notoriously difficult...