I really don't think you need to worry too much!
Back is mid 70's I used a mouth turkey call with a lead base that almost got me into trouble but doctor was smart enough to ask questions, shortly after the ones made with lead seemed to disappear from the market, but if you find one don't use it!
I did find a better mouth call not made from lead but that got me into more trouble, called an 80 year old hunter who couldn't see within 30 yards and he blew me out from behind the big pine tree where I was sitting, yes I had orange on just not enough or he couldn't tell the difference, anyway I have been carring 2 double ought buck from a 12 guage mag in my arm ever since!
After 30 years the only trouble I have had is trying to explain anytime I need to have an xray done, even had the cops called in once!
Ya should have seen the look on his face when he came to gut me..... mostly cause he found himself looking at the barrel of my brothers gun who was hunting close to me at the time. Brother told him if had just waited a couple of minutes longer there were about 8 real turkeys headed right towards me that he couldn't get a shot at!