If you would like to send me through all the details, photos of the numbers and plates you have I will try and make some sense of it for you. Details of the engine number will be needed as well. All info will be kept strictly confidential.
All Minis upto June 1969 had a build plate fitted and as well the body number was stamped in the firewall as well as in the top of the radiator shroud. You usually need to remove the layers of paint to reveal the numbers in the shroud. If it is a Deluxe it should have another number in the shroud as well, namely M2/05. This number is usually very faint and can take some effort to reveal.
Hope this assists and look forward to solving your problem. If you wish send the data to
[email protected]