Stock Leaf Spring Question

I recently bought a 1999 Tacoma access cab V6 4x4 TRD with a fiberglass cap over the bed. I am trying to determine the stock rear leaf spring configuration. I've looked over the "Suspension" and "1st Gen" forums and can't seem to find exactly what I'm looking for. The truck sits pretty much level, maybe even a little higher in the back. The front section of the leaf springs have a bit of negative arch and the rear section of the leaf springs are pretty flat. My question is is that what the leaves should look like? or are they looking a bit tired? I also noticed that the leaves are marked "Made in Mexico". Do you think that they are stock or replacements? Thanks for your help.