Yeah, there is no solid information that the three MiG kill stars can be attributed to THIS aircraft. Units were not very careful with that custom. If you go through the references, it's difficult to credit a particular airframe to a kill. Sometimes the victory mark was for the pilot and it traveled with him to another airframe that had his name on the canopy rail. Sometimes they changed the canopy rail name to his on the machine he used for the kill. Aviation artists have also added to the confusion with their interpretations. For example, Fujimi's 1/72 A-4C kit from a couple of decades ago show the Skyhawk downing a MiG-17, but the aircraft is shown in markings it carried years after the kill. The cover painting on Shiffer's book on the F-84 Thunderjet shows Jacob Kratt shooting down a MiG, but the Thuderjet depicted is one that he flew later on in the U.S. that had his three MiG kills marked.
There's not much we modelers can do about it other than try to model to an instant in history depicted in snapshots of the time. If you do that, you won't be making the historical error.