For purposes of paragraph (d)(2)(ii) of this section, a sale is one of a series of sales if the seller plans to dispose of, in separate transactions, substantially all of the seller's household goods, personal effects, and other tangible personal property described in § 70.241 of this part.
Delivery of the notice described in paragraph (i)(3) of this section may be made by any means, including regular mail, and delivery of the notice shall be effective only from the time of actual receipt of the notification by the insuring organization. The provisions of this paragraph are applicable to matured as well as unmatured insurance contracts.
27 C.F.R. § 70.231
26 U.S.C. 6323