Good for you on the observation and paying attention to detail.
I have never seen silver primers used by Remington. All I have encountered were the brass primers.
But who knows how old they are, Look very close at the cases--every aspect of them.
If they are reloads you should be able to pick up little tell tale indications.
Die marks, scratches on the cases and so on. I wont shoot unknown reloads
I would call Remington, one miss hap can ruin a good day.