Kernrechtsfrage
Whether the appeal met the formal requirements, including attachment of the challenged decision.
Extrahierter Entscheid
The appeal did not meet the formal requirements of Art. 42(1) and (2) BGG and remained defective after the warning.
Extrahierte Begründung
The appellant failed to cure the missing attachment within the deadline set by the Court; the warning was deemed properly served despite being returned uncollected.