At the end of that episode you have: 1. All the remaining Borg wreckage in the Arctic is still there. What happened to it? Can't just leave it sitting there. 2. The Enterprise fired two Borgified Tarkaleans in to space. What happened to their bodies? Presumably Enterprise went back to get them. Can't just leave them floating around, waiting for a ship to unwittingly take them on board. 3. The Borgified transport wreckage, which included to large visually intact sections. Where is that at? Too big to fit in Enterprise, and the NX 01 doesn't have a tractor beam....sooooo. Who picked it up? Maybe the Vulcans. IDK. Maybe various Starfleet ships were dispatched to collect it? Can't just leave that stuff floating around in space.