Best Case to Load Up?

[DrakeHellsing]

In particular, to save survivors for North Peak (as that's the last shelter I need to load up), which case should I load up for that in particular anyway.  As I need to max out the shelter, but finding survivors in North Peak wasn't going well for me, they didn't really seem to spawn all that much.  And I do need to buy the remaining maps from them, as well as that skill book too before I go about collecting everything I need in North Peak (and that damn blueprint outside the school in West Ridge).

 

Problem is, I don't want to load up a case that's too late (as in, at night time), like the 5th one I believe, where it's night (or it was the 6th, can't quite recall).