lifespan of contents in condiment packets.

Factual Questions
1

I eat my share of fast food every now and then. I also take more condiment packets than I need. Rather than putting them back into the condiment bins, I just take them home with me. However, I have some packets which I’ve had for quite some time.

I’m looking at one now, and it’s copyrighted 1999. I have no intention of using it, but, that got me wondering – just how long does the stuff inside last? I’ve never seen an expiration date on them, so what is the consensus on the lifespan?

2

Here’s a thread on a similar subject from December: Can Taco Bell sauce go bad?

3

That stuff lasts, simply, forever.

If should be called preserva-sauce.