If the SM stole your funds it should have been reported to the police as it is straight forward theft.
Also you need to look through your own records and try and find out which insurance company (if any) covered you at the time of the theft because their is generally cover for theft from Strata funds and so you could get your money back this way.
If your SM hadn’t been paying your insurance you are stuffed unless you can find this SM and take action against him for embezzlement in a civil court (expensive).