It is generally intact, but quite dirty inside, and some of the remaining items that were not relocated are a bit soggy and mud-covered. I fear that may not bode well for some supplies but others may be only superficially dirty and thus salvageable.

But, yes, as we find things of use, the store itself seems a perfectly decent place to collect them. Lady Pudding has been keeping an inventory, she may be able to stay on top of those records.