whether if - Fourth conditional type (past and possible)?

I learn that there are 3 types of conditional sentences:

• Type 1 (present and possible): If I have money (and it's possible one day), I will donate.


• Type 2 (present and impossible): If I had money now (but I don't), I would donate.


• Type 3 (past and impossible): If I had had money (but I didn't), I would have donated.

What if I want to express something in the past that is possible, eg. If he had money before (and I don't know if he did, but it is possible), then he would donate?