At the end of the day, all services are basically the same. They check all the wear items, change the oil and oil filter, change the air filter if it needs it and top up fluids if they need to be. All other major items are Mileage/age dependent as previously mentioned, and will only be changed if you tell them.
If you have no receipts for things being done, check the belts for wear, change if necessary, then change the spark plugs, brake/clutch fluid, gear and diff oil and coolant, then you'll know where you are and can breath comfortably knowing every things been done