If the hammer falls with the thumb safety engaged, then obviously the thumb safety does not block the sear enough to forbid every movement. Take off the grip safety and reassemble the gun. Now you can work that thumb safety and see how much gap there is between it and the sear, when it is in the upper position. If it is very very little, you can peen the safety so that it blocks the sear completely, if it is significant (the gap) then you need a new safety.
As for the grip safety, you can do the same thing. Disassemble the gun and reassemble it but without the sear/disconnector. Just the trigger. Then insert the grip safety and secure it on the frame by inserting the thumb safety from the RIGHT side of the frame, not from the left. With a powerful light, you can now peek through the thumb safety's opening and see how far away the grip safety's tongue is from the rear of the trigger. If it is a very little, you can peen the tongue. If it is too much, you need a new grip safety.
It looks as if whoever took away your gun didn't want the safeties working properly.
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