WM was backlogged for quite a while, so I suspect a lot of us got back our bags around the same time. I sent in both a Summerlite and an Ultralite to be restuffed, and yes, overstuffed. DItto for the pretty fair price they charged.
Not a "brand new" weight, but before I hiked the AT with it my summerlite in a cuben drybag weighed 571g, or 20.1 oz. Now in the same drybag it weighs 679g, or 24.0 oz, so almost 3 oz heavier. I'm sure that some of that isn't overstuffed weight, but "bringing it back to specs" weight, with the rest being overstuffing.
A similar comparison to the Ultralite, before the AT in a silnylon drybag it weighed 844g, or 31.2 oz, now it weighs 988g, or 34.9 oz, so a little more than a 3 oz gain there.
I didn't weigh the bags just before sending them in, but both had lost significant featherage over the course of quite a lot of use. Holding them up to a light source there were clear and numerous gaps, which are all filled-in now. I'm going to be a warm and happy boy this year.