Janet did you file a report with your local police dept? If not go do it!! They will go to UPS to inform them of your action and that might light a fire under them to start looking for it harder!! I would also file a complaint with the better business bureau against UPS. Last but not least..write a letter to the editor of your local paper about it. UPS won't like the negative attention they are getting..when all else fails I would stand in front of their building with a sign with lemons on it that says "UPS service has left a sour taste in my mouth!!"
By any chance did you put the word 'quilt' anywhere on the outside of the box? My postmaster told me to never ever do that!! It is a red flag for theives. He said NOT all postal employees are honest. Especially at the holidays when they hire extra help. My son moved a few months ago and his wife was driving by their old house one day after work and noticed that there we 2 big boxes on the front porch of their old house. She stopped and they were my son's t-shirts he had ordered. He designs his own Christian shirts. They had the new street address...they had lived there for several years so the UPS driver was used to just delivering to that address. Guess he didn't bother to look at the new address and just left them sitting on the porch. Good thing my DIL saw them or they could have walked away.
Good luck and I do hope it is returned to you..Linda B.