> If the rationales that justified the initial retention of the plaintiffs’ effects dissipated, and if no new justification for retaining the effects arose, then the Fourth Amendment obliged the MPD to return the plaintiffs’ effects.
...and even addresses acceptable reasons for delay:
> we do not suggest that it must always return the property instantaneously. Matching a person with his effects can be difficult, as can the logistics of storage and inventory.
The court's opinion is basically that once the criminal complaint is resolved and the investigation is terminated, the gov't has no reason to hold the property and it must be returned. If it takes them a few days or weeks to get the stuff out of inventory and coordinate the return that's fine, but they can't continue holding it just because they feel like it.