Find a marine surveyor from that area to look the boat over. Being that your not local there is a lot more reason to have one check the boat itself out. I would recommend one either way, but before you fly out or drive to ever see it knowing any known issues are good. Even if it is simple things like light bulbs or wipers, every little thing they find makes your job easier to know what you need to invest and do to get her usable. More then likely there are not issues, this model is a very sound boat so as long as it wasn't really neglected they shouldn't find anything major, but it is good to have it checked. The engine records will help as well, hopefully most of the use was at low troll rpm's or at cruise and not above. High hours above cruise will put more wear on the engine and deminish its life, normal operation should not effect it much.
BobP is 100% correct, change the oil, put in new gasket's and o rings. Change all filters, and I would even recommend maybe even having the engines services by Yamaha. If not, put new plugs in along with the filters. Change your lower unit oil, even if it has been done recently, it lasts about 100 hrs they claim, so changing it now will give you a good portion of a season before you need to pull her and redo it. I would also recommend brand new batteries when buying a used boat, you never know how well they were kept or how they were used, start with a clean slate with all matching batteries, never mix. I am putting new one's in my 265, looking at either Optima's or DieHard AGM's as of now, the more power the better. I have 3 batteries in my boat, if you only have 2, have it wired so that your stbd engine/ house batteries have 2, one battery is pushing it to start that engine as well as run your house loads.