Abandoned motorbike, what to do with it?

I work for a property managment company, and occasionally, we have vehicles dumped on our land. Most of the time tho they are stolen vehicles and a quick PNC check usually suffices.

This belongs to someone we know, but they have vanished into the abyss, no contact details et. We have no keys nor log book or anything , so Im thinking I cant scrap it ( can i?) I cant take it to the tip ( can i?) and id be blown if I can sell it!

We must have rid of it pronto , so all suggestions welcome

thanks