I still have a couple packages of CCI small rifle and pistol magnum primers from the mid 1980s. Price tag is $1.50; I purchased these primers from Jensen's Custom Ammunition in Tucson, AZ (no longer in business). I suspect your primers are from the 1970s based upon price and packaging graphics. Your primers will probably work; I would be very cautious and stay alert for potential squib-like loads due to under-performing primers. You do not want to have a bullet lodged in your barrel and fire another round into a blocked barrel.
If your primers were not subject to moisture / humid conditions; I suspect they will function reliably like when they were manufactured. The condition of the packaging is near flawless (unlike mine shown below); maybe yours have a collectors value? I have never heard of reloading equipment collectors' like you hear about toy collectors'. I think someone who obtains older reloading equipment is likely to want to actually use it, unlike collectors'.
I seem to recall, having seating problems back in the ‘70s, using CCI primers. Large rifle mostly. Of course in those days I was priming on a RCBS Rock Chucker, which never had the best priming system. Today, I’m a fan of CCI primers!
My dad was getting them from Gemco up in Northern California (Eureka) but they were small rifle and were red cased. Price might have been 75-78 cents per hundred. Early 70's. We were just starting to get into reloading for a rifle he got me after High School. Pick up a Remington model 788 in 222 from Payless Drugs for $68.00. Still have it today.