Our 2014 4/4 has a handbook with dealer stamps etc for service in the back. I would expect a 3.7 Roadster to have one.
Were I to sell it, it would have all the service stamps as well as the receipts showing exactly what maintenance was done and when.
Was the car for sale at a Morgan dealer?
As Graham says, you should have some service history even if in the form of receipts and bills.
If no history at all, I suggest walking away and finding a car that has some proof of being cared for.