@ couldbeanyone
If you are certain about the type of ammunition it was, then I suggest you get hold of a magnet and see if the bullets are ferrous (the ones in your box). If they are obviously ferrous, then push for removal or else you may have discomfort in the future with MRI scans. The other option is that you get somebody to check the X-rays to exclude the presence of jacketing attached to the fragments (lead and jacketing have different radiological densities, as visible in the attached radiograph of a guy shot in the foot). This was from a ricochet by the way.
A = small piece of lead (daughter fragment)
B = small piece of lead with attached jacketing (daughter fragment)
C = piece of peeled jacketing attached to parent fragment
D = parent fragment, radiologically it is a jacketed bullet fragment
And here is that main fragment, just after it was retrieved from the patient's foot:
The underside of that bullet fragment was flattened and had rough striations, indicating to me that it was a ricochet. The patient was struck by half a bullet and it passed through his leather shoe and entered the foot, making a curious entrance wound that was more like a short incision than a gunshot wound. The entrance wound can be very unusual in ricochet wounds.