I found an old box of Tuna Helper buried in the back of the cabinet. The expiration date on it is from 2008. I'd just bought a ton of * Helper, and this box seemed unusually heavy. I checked the weight and it said it contained 8.4 ounces. I checked the other * Helper boxes, and they were all 4 to 6 ounces!
The instructions also call for a 7 ounce can of tuna. Good luck with that, since almost all tuna comes in 5 ounce cans now.
Nothing like a little time capsule to show just how much the manufacturers have been shrinking their products.