So your actual intention is to buy a (old) bike site unseen then ride off into the sunset.
When you see something like a Mk3 Commando for $2100,hit the back button immediately,if you havn't done your homework (monitored prices over a reasonable period) already you will be a prime target for being ripped off.
If in doubt reverse the situation,it is no different to a thread in another forum here,naval officers on cruise ships,oil rigs,out of town etc etc and other rubbish,people willing to trust (you the buyer) and send you a bike or ship freight at their expense or whatever,would you do that,of course not yet people fall for these scams daily because they are stupid,greedy (bargain) or simply ignorant to market values,most common is greed.
If a for sale ad reads like bullshit that is what it is or the actual seller is a drongo.
It is the same world wide,seller and buyer perception is different especially when it comes to a sale.
If you find a mechanically reliable 40 year old bike that is owned by a actual skilled enthusiast or someone with the money to get a professional to maintain said bike and is then selling it at a good price,good luck,anything is possible.
What is more realistic is getting a low end bike that will give you drama's,regard anything a seller says with caution regarding condition unless you were able to pick up a known bike off this website from a member with a reputation for being up to speed in general.
The safe option if it is only a few week trip is getting a rental.