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When I returned my four gourami to the LFS I got some ottos for my 12 gallon and this container of Java Moss. When I got it home I thought it looked dead.
It is pretty tough to kill java moss. Even if it doesn't look great it will most likely bounce back once put into your tank, assuming your lighting is decent.
I agree that it's pretty hard to actually kill without it being able to bounce back. I'd just rinse it off well, attach it to DW, and place it where it will recieve good light. I got in some flame moss last year that was totally brown and truely looked dead but went ahead and attached it to my DW and it did finally green up and started to grow. It took awhile so you just need to be patient with it.
I took it out of the original container (with the price) and rinsed it and put it in an empty betta cup for the photo. There is no white stuff, sorry. Closeups attached.
I agree with the above. It's Kinda funny but one of my LFS just started getting java moss packaged the same way. When I saw it floating in the tanks in those solo cups I laughingly ask the new store manager if he was trying kill it or sell it. He smiled and admitted he knew nothing about fish or aquatic plants and asked me what to do. I just said I'm no expert but putting holes in the cup would let fresh water in at least.