Mozza, I have a similar problem in that now that W has her own place, she's taken a lot of her stuff, but not all. As much as I'd like to pack the rest up and leave it out front for her, I worry that would give her the final push she needs to file for D. Leaving some of her things at the house means she still has an attachment to it, so the possibility of coming back is always open.
Does it hurt to look at some of her clothes when I walk into the closet? Sure, but it also gives me hope because it represents her conflicted feelings. If your W was dead set on being done, she could easily stop by, walk room to room and collect every last thing of hers.