Paying the teachers of a school which closed down 3 months notice period salary

I used to work in my uncle's school as finance manager 8 years ago. I was basically all in all in that school. I had teachers in that school on
contract mentioning three months job termination period. School was in loss and I had to sell the school, all teachers lost job because new owner didn't hire them. I could pay only one month notice period and current month salary to the contract holder teachers. The teachers without renewed contract or teachers passing probation period but without new contract got only current month salary. Now I feel I should have paid complete three months notice period but I didn't have funds at that time. Now I am in a position to pay them but I lost their contact numbers plus I don't remember the actual amount of the different teachers. At that time what I got from the sale, I paid all to the staff and one PDC cheque I gave to my uncle and went back to my city to restart my career. What should I do?