( it was only an observation)The bus will be fine , as long as it was serviced ( & I’m sure it was ) it doesn’t matter who done it , engine will be good , just the rust you got to worry about which I’m sure you are more than capable of fixing, you got a bargain, all will be good for the price you paid , looking forward to your build threadBut all the same garage and all the same phone number i may give them a phone and ask them to confirm it.
They may also have a record of all work done to it which would be good.