Okla. Stat. tit. 67, § 67-252: Preservation period

Unless a specific period is designated by law for their

preservation, business records which persons by the law of this

state are required to keep or preserve may be destroyed after the

expiration of three (3) years from the making of such records

without constituting an offense under such laws. This section does

not apply to minute books of corporation nor to records of sales or

other transactions involving weapons, poisons or other dangerous

articles or substances capable of use in the commission of crimes.