Okla. Stat. tit. 58, § 58-335: Claims paid when not proved and allowed

When it shall appear upon the settlement of the accounts of any

personal representative that a debt or debts of the deceased have

been paid without the presentment of a claim pursuant to Section 334

of this title, and it shall be proven by competent evidence to the

satisfaction of the district court that each such debt was justly

due but for the claimant's failure to properly present a claim, was

paid in good faith, that the amount paid was the true amount of each

such indebtedness over and above all payments or setoffs, and that

the estate is solvent, it shall be the duty of the said court to

allow the said sums so paid in the settlement of said accounts, and

the payment of any such debt shall not constitute a breach of

fiduciary duty or responsibility by the personal representative.