mail then paid to the bank the balance due on the bank loan.
In the spring of 1982, Davis again approached Hill, asking for two fake MSOs. Hill supplied Davis as requested and Davis used the MSOs to obtain loans from two other banks. Davis also reported these trucks stolen, mailed loss notices and filed claims with the insurance company. These claims were eventually paid by mail with the proceeds going directly to the banks in order to pay off the loans purportedly used to purchase the trucks. The foregoing facts form the basis for counts one, two and three charging false statements to a federally insured bank in connection with the loans and for counts four and five charging mail fraud in connection with the insurance claims and payments.
On November 2, 1982, pursuant to a general investigation of Hill and other persons involved in insurance and bank fraud schemes in the Dallas area, a grand jury subpoenaed Davis and ordered him to appear before it on November 30, 1982. Davis was also ordered to bring with him documents from April 1, 1978, to the date of the subpoena regarding relations and transactions between his company, Paul Davis Wholesale Trucks, Inc., and Curtis Hill or his companies, Dal-Tex Motors, Inc., or Oil Patch Equipment Company. Davis appeared, as ordered, but claimed that he had been unable to locate any relevant documents. The grand jury allowed him further time to complete his search, and reset the appearance date to January 11, 1983. On that date Davis appeared, and he again reported that his search had failed to locate any documents relevant to the subpoena.
About September 7, 1983, pursuant to a “reciprocal” discovery agreement between the government and Davis’ defense counsel, H. Jay Ethington, Agent Foster of the United States Secret Service examined Ethington’s files relating to Davis. There Foster found documents that had been subpoenaed by the grand jury, but which were never produced by Davis. At the trial, Dillard, a former employee of Davis, testified that these documents had been removed from Davis’ office to his house immediately after Davis became aware of an investigation. Davis’ failure to comply with the subpoena forms the basis for count six charging obstruction of justice.
Prior to trial, Dillard agreed to cooperate with the Secret Service in their prosecution of Davis. About this time Dillard began receiving telephone calls from Davis. On the morning of September 8, 1983, one of these calls was taped by the government; it recorded a conversation in which Davis sought to meet with Dillard in order to inform him what he (Davis) planned to say at the trial, and what he wished Dillard to say. Shortly after this phone call, on the same day, Davis visited Dillard’s home to talk further with him. The phone conversation and the subsequent in-person conversation between Davis and Dillard form the basis for count seven also charging obstruction of justice.
II. Sufficiency of the Evidence
Davis challenges the sufficiency of the evidence to sustain his convictions for making false statements to federally insured banks, for mail fraud and for obstruction of justice. The appropriate standard of review for such a contention is whether a “reasonable trier of fact could find that the evidence establishes guilt beyond a reasonable doubt.” United States v. Aguirre Aguirre, 716 F.2d 293, 297 (5th Cir.1983). Because it is the sole province of the jury to weigh the evidence and the credibility of the witnesses, an appellate court cannot rebalance that assessment of credibility. Therefore, the appropriate question as to sufficiency of the evidence is to ask merely whether there exists in the record substantial evidence in support of the jury’s finding. United States v. Niver, 689 F.2d 520, 529 (5th Cir.1982). “In making that determination, this Court must view the evidence and all reasonable inferences which may be drawn therefrom, in the light most favorable to the government.” Aguirre Aguirre, supra, at 297 (citing Glasser v. United States, 315 U.S.