Texas Estates Code - EST § 359.003. Supporting Vouchers and Other Documents Attached to Account

(1) a voucher for each item of credit claimed in the account or, to support the item in the absence of the voucher, other evidence satisfactory to the court;

(2) an official letter from the bank or other depository where the estate money on hand is deposited that shows the amounts in general or special deposits;  and

(3) proof of the existence and possession of:

(1) additional evidence of the existence and custody of the securities and other personal property as the court considers proper;  and

(2) the personal representative at any time to exhibit the securities and other personal property to the court or another person designated by the court at the place where the securities and other personal property are held for safekeeping.