For purposes of subdivision (iii) of this subparagraph, no person can improve his position with respect to the lien by reacquiring the interest from an intervening purchaser or holder of a security interest against whom the lien is invalid.
Example. A purchases a refrigerator from the M company, a retail appliance dealer. Prior to such purchase, a notice of lien was filed with respect to M's delinquent tax liability in accordance with § 301.6323(f)-1 . At the time of the purchase A knows of the existence of the lien. However, A does not intend the purchase to hinder, evade, or defeat the collection of any internal revenue tax, and A does not have any reason to believe that the purchase will affect the collection of any internal revenue tax. Even though notice of lien was filed before the purchase, the lien is not valid against A because A in good faith purchased the refrigerator at retail in the ordinary course of the M company's business.
For purposes of subdivision (ii) of this subparagraph, a sale is one of a series of sales if the seller plans to dispose of, in separate transactions, substantially all of his household goods, personal effects, and other tangible personal property described in § 301.6334-1 .
Delivery of the notice described in subdivision (iii) of this subparagraph 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.
26 C.F.R. §301.6323(b)-1