If I was in your shoes, I would check the hardness of the welds in question and compare them to the hardness of a P3 weld you know was subject to the proper PWHT.
Charles.
ps - If you look in B31.3., Table 331.1.1, there is guidance on what the acceptable hardness is following PWHT. Remember though, unless it the specified code, it may only be used as guidance.