Maybe it's standard for prepaid labels, but when I checked the tracking number that the FedEx office (not drop off location, actual FedEx store) gave me, it shows 2.6 pounds and not the 6 that the package weighed when it came in (it should be ever so slightly heavier with the extra tape and 3 pages of paper added).
FedEx customer support stated that they don't even see that weight yet, so maybe it just needs to wend it's way through the system to get an updated weight? If not, I hope that office has good cameras, because the guy behind the desk asked if I worked for Nvidia - I said no, just returned a RMA that was delivered physically damaged.
Man, I really hope that it just needs to get further into the system and not the thing that I dread happened at the FedEx Print and Ship Center.
Edit - to put a bit more perspective on it, I did the same thing and checked my original card's RMA FedEx tracking number when I got home (my own box and packing material) and it was over 10 pounds using the same FedEx location. So, that's why I'm a bit freaked out.