Key legal question
Whether the sealed bank documents should be unsealed for examination in mutual legal assistance proceedings.
Extracted holding
The documents may be unsealed because they can be useful for the foreign investigation; only the admissibility of the search is decided here.
Extracted reasoning
Under Art. 9 IRSG and Art. 69 BStP, unsealing is permissible where the documents may be useful for the foreign investigation. The envelopes contained material that could clarify origin, route, payments, and possible criminal association, so the usefulness threshold was met despite procedural irregularities in sealing.