How do I isolate objects against a white background?

[Rufio]

I have about 125 RAW files of random objects that were shot against an white background in a home made light box.

My goal is simple, to isolate the objects against a completely white background whilst still maintaining the shadow of the object (if possible). I have been using Lightroom 4 and a lot of brushes to complete such a task, but I know there is a simpler way to accomplish this with Photoshop. I am using Photoshop CS6.


Here are what I think are the three most tricky pictures:
View attachment DSC_0733.zipView attachment DSC_0749.zipView attachment DSC_0778.zip


thanks for any help or suggestions,
-Rufio

 

[ibis]

the best i could get in less then a minute:

you may want to lighten it all up a bit more, but you'll loose the glass reflection.
there is no easy way (as far as i know). you may dodge the background more but it will take off the realism.