If they were kept dry and not allowed to get overly hot, they should be OK.
Load a few in sized cases and test fire them. If they "pop", they should be good.
Powder is what you have to keep cool and dry. I had an un-AIRCONDITIONED shop that I reloaded in. I had some surplus H322 and H414 that I bought in 8lb kegs in the late '80's. The H322 deterioated and ate up the cases and the powder "soured" that was left in the keg. Had to throw out the last 1-2lbs, and many of the loaded rounds that went unfired (mostly some .35Rem) had to be disassembled to salvage the bullets. Powder, primers, and cases were ruined.
Primers will ususally hold up unless temps are extreame. Then they likely go "pop" on their own making a real mess! (exploded shop/fire).
I keep all my powder(s) in an old refrigerator (not so old Maytag.. with thermostat set in warmest setting to save power ~43degF) in my basement garage to comply with fire codes. Primers are kept in a seperate room (gun room/walk-in safe) that is airconditioned/heated, so deterioration isn't an issue.