Whether the appeal against the Bern coercive-measures court's unsealing order was admissible
Yes; the coercive-measures court was the sole cantonal instance for the unsealing decision, and the appellants had standing and a risk of irreparable harm.
Under the StPO and BGG, unsealing decisions by the cantonal coercive-measures court in federal jurisdiction are final, so the double-instance requirement is excepted; holders of sealed material may challenge the order.