I ordered a set of 13" Progressive 440s from HDL on sale about 12 years ago and have been using them ever since. One failed recently and lost oil. I returned them to Progressive a couple weeks ago and today I found a box of brand new pair of 440s waiting for me when I got home! That's what I call excellent above-and-beyond customer service!
Sorry, I doubt they actually REPLACED them with a New Pair.
I've been there with one leaking. They said send 'em both in and we'll rebuild both & clean & polish & test the springs and replace if necessary.
When I opened my box I thought the same thing - Wow new shocks, but I found my original L & R makings [engravings] on the bottom of each.