[Catcatdog]

I boxed a 3lb package using dry ice, and dropped it off right when FedEx was closing for the weekend, so that the dry ice could subliminate overnight.

On Monday, they updated the tracking weight to reflect the weight of empty box after sublimination! The tracking doesn't show 3lbs anymore.

The dry ice method probably doesn't work for FedEx.

Did they measured the weight upon you drop it off in front of you when they got the package? If yes the weight should be 3lbs if they decided to weight it on Monday and upload the info on Monday that explains alot..