The first thing to look for in the gear, or to buy, is the BOOK. I think Lyman is the best reference, 48th edition just out. Speer is ok, too.
Otherwise, it depends on how long, modern components are pretty stable.
Decomposing powder will have an acid smell - not the acetone, alcohol, and ether odor of fresh, get somebody to let you sniff a can - may put out red nitrate fumes, and will be corroding a metal can.
A bad primer just doesn't go off, they don't get stronger with age. Test small samples then work up to larger batches. If they fire, great. If you still have doubts use them for practice, not match competition, trophy hunting, or self defense.
I think it is worth a try. There is WW II ammo still being sold and I somehow doubt the French and Russians had it in air conditioned warehouses. Most is ok, some is erratic. Hodgdon recently took old H870 off the market after many, many years because their remaining inventory of surplus powder of that grade was going bad.