27 C.F.R. § 40.406

A manufacturer of cigarette papers and tubes shall file a new bond to supersede the current bond immediately when:

(a) The corporate surety on the current bond becomes insolvent,

(b) The appropriate TTB officer approves a request from the surety of the current bond to terminate liability under the bond,

(c) Payment of any liability under a bond is made by the surety thereon, or

(d) The appropriate TTB officer considers such a superseding bond necessary for the protection of the revenue.