I think mine actually came empty with the boot and grease nipple separate. You don't need a grease gun for installation though, just for maintenance. Just clean the joint well and pack the boot full of chassis grease before you put the end together. When you put the grease-filled boot on the end, the extra grease should squeeze out through the threads for the grease nipple. Clean it off, thread the nipple in, install and enjoy

Hey Ian, did a little research and found this:
Moog warranties their parts and products to be free from defects in materials and workmanship for one year from the date of purchase.

You sure about the lifetime?

Sorry, I forgot we let a few things slip by here at work. Moog (along with a few other manufacturers) put a lifetime warranty on their parts provided they are installed by a professional. Backyard mechanics get a 1 year warranty.

We honour the lifetime warranties even for our backyard mechanic accounts...

oh cool, that's good to know.

Picked mine up today and they were already filled.
Also, after installing them she likes to turn left a little more then right. Just a little snappier that is but it drives straight.
I counted the turns off the original ones and tried to match them as close as I could. I'm dead even on the passenger side and minus 1/2 turn on the driver side. Imagine that has to do with the slight pull. *Sigh... might need an alignment afterall.