Charles Keenan was convicted of mail fraud in violation of 18 U.S.C. §§ 1341 and 2.1 On appeal he contends the evidence *42adduced at trial was not sufficient to support his conviction. We agree, and for the reasons stated in this opinion we reverse the judgment of the district court.
Keenan and John Colagrosso were indicted for scheming to defraud the Carboloy Mining Products Section of the General Electric Distribution Center (Carboloy) and the Marathon Coal Bit Company, Inc. (Marathon) of money and property through the use of the mails. The indictment charges the scheme was devised in the latter part of June, 1979, when the appellant met Colagrosso and expressed his interest in obtaining some roof pinning bits. At a second meeting, after some initial reluctance, Colagrosso, a truck driver for Marathon, told Keenan he might be able to get some bits on his next trip to Clarksburg.
On July 2, 1979, Cologrosso went to the Carboloy plant in Clarksburg to pick up some material for Marathon. Using a fabricated purchase order number purportedly chargeable to Marathon, he obtained two pallets of roof pinning bits which he sold to Keenan for $9,000.2 Carboloy, in the course of business, mailed an invoice for this purchase to Marathon. The invoice was received by Marathon on July 17, 1979, and shortly thereafter Colagrosso’s involvement in the theft was discovered.
Based upon Carboloy’s mailing of the invoice, both Colagrosso and Keenan were indicated for mail fraud. Although he initially attempted to conceal Keenan’s role in the theft, Colagrosso eventually implicated the appellant. Colagrosso entered a plea of guilty to the charges of mail fraud and testified as the chief prosecution witness in Keenan’s trial. The jury found the appellant “guilty as charged within the indictment.”
To sustain a conviction for mail fraud the government must prove the existence of a scheme to defraud which involves the use of the mails for the purpose of executing the scheme. United States v. Brewer, 528 F.2d 492, 494 (4th Cir. 1975). Keenan contends the government’s proof was insufficient to establish the elements of the offense. Because we find the mailing was not for the purpose of executing the scheme to defraud Marathon and Carboloy, we do not decide if the government met its burden of proving Keenan’s participation in or knowledge of the fraudulent scheme.3
Whether a mailing is deemed to be for the purpose of executing a scheme to defraud depends on “whether the mailings were sufficiently closely related to [the defendant’s] scheme to bring his conduct within the statute.” United States v. Maze, 414 U.S. 395, 399, 94 S.Ct. 645, 647, 38 L.Ed.2d 603 (1974). In Maze the defendant obtained goods and services from motels in several states using a stolen credit card. The motel operators mailed invoices to the bank which had issued the credit card; the *43bank mailed statements to the true owner of the credit card. The Court found the scheme to defraud had reached fruition before the mailings occurred because the object of the scheme — to obtain services from the motels — had been accomplished when Maze checked out. The mailing of the invoices in no way affected the success of the scheme. 414 U.S. 402, 94 S.Ct. 649. Instead the mailings were directed at adjusting the accounts between the motel proprietors, the bank, and the owner of the credit card. Because the mailings were for a purpose other than the scheme, Maze’s conduct was not within the mail fraud statute. 414 U.S. at 405, 94 S.Ct. at 651.
We are faced with similar facts in this appeal.4 The object of the scheme to defraud Carboloy and Marathon was accomplished when Colagrosso got his money and Keenan got his bits. The mailing clearly occurred after the scheme had reached fruition. A mailing which occurs after the object of the scheme has been completed is not sufficiently related to the scheme to support a conviction for mail fraud. United States v. Tarnopol, 561 F.2d 466, 472 (3rd Cir. 1977).
We are unpersuaded by the government’s argument that because an integral part of the scheme was to have Marathon process the invoice in the normal course of business, the scheme continued until the invoice was received.5 We recognize that the use of the mails to conceal a scheme can be conduct which comes within the mail fraud statute. United States v. Sampson, 371 U.S. 75, 83 S.Ct. 173, 9 L.Ed.2d 136 (1962). In Sampson the defendants made a “deliberate, planned use” of the mails to lull their victims into a false sense of security. 371 U.S. 80, 83 S.Ct. 175. Thus the purpose of the mailing was to delay detection of the fraudulent scheme. In contrast, the mailing here was made by a party not associated with the fraudulent scheme and most likely contributed to, rather than prevented, the detection of the scheme.
Because the government failed to adequately link the mailing of the invoice to the scheme to defraud, Keenan’s conviction for mail fraud cannot stand. “The federal mail fraud statute does not purport to reach all frauds, but only those limited instances in which the use of the mails is a part of the execution of the fraud, leaving all other cases to be dealt with by appropriate state law.” Kann v. United States, 323 U.S. 88, 95, 65 S.Ct. 88, 151 (1944). Accordingly, the judgment of the district court is reversed.6
REVERSED.